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pnpbios: convert to seq_file
Convert code away from ->read_proc/->write_proc interfaces. Switch to
proc_create()/proc_create_data() which make addition of proc entries
reliable wrt NULL ->proc_fops, NULL ->data and so on.
Problem with ->read_proc et al is described here commit
786d7e1612 "Fix rmmod/read/write races in
/proc entries"
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Adam Belay <abelay@mit.edu>
Cc: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Alexey Dobriyan
Linus Torvalds
parent
d52f235f17
commit
5116fa2b3a
1 changed files with 131 additions and 77 deletions
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@ -24,6 +24,7 @@
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#include <linux/types.h>
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#include <linux/proc_fs.h>
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#include <linux/pnp.h>
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#include <linux/seq_file.h>
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#include <linux/init.h>
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#include <asm/uaccess.h>
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@ -33,42 +34,65 @@
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static struct proc_dir_entry *proc_pnp = NULL;
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static struct proc_dir_entry *proc_pnp_boot = NULL;
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static int proc_read_pnpconfig(char *buf, char **start, off_t pos,
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int count, int *eof, void *data)
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static int pnpconfig_proc_show(struct seq_file *m, void *v)
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{
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struct pnp_isa_config_struc pnps;
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if (pnp_bios_isapnp_config(&pnps))
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return -EIO;
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return snprintf(buf, count,
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"structure_revision %d\n"
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seq_printf(m, "structure_revision %d\n"
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"number_of_CSNs %d\n"
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"ISA_read_data_port 0x%x\n",
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pnps.revision, pnps.no_csns, pnps.isa_rd_data_port);
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return 0;
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}
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static int proc_read_escdinfo(char *buf, char **start, off_t pos,
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int count, int *eof, void *data)
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static int pnpconfig_proc_open(struct inode *inode, struct file *file)
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{
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return single_open(file, pnpconfig_proc_show, NULL);
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}
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static const struct file_operations pnpconfig_proc_fops = {
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.owner = THIS_MODULE,
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.open = pnpconfig_proc_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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};
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static int escd_info_proc_show(struct seq_file *m, void *v)
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{
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struct escd_info_struc escd;
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if (pnp_bios_escd_info(&escd))
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return -EIO;
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return snprintf(buf, count,
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"min_ESCD_write_size %d\n"
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seq_printf(m, "min_ESCD_write_size %d\n"
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"ESCD_size %d\n"
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"NVRAM_base 0x%x\n",
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escd.min_escd_write_size,
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escd.escd_size, escd.nv_storage_base);
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return 0;
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}
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static int escd_info_proc_open(struct inode *inode, struct file *file)
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{
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return single_open(file, escd_info_proc_show, NULL);
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}
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static const struct file_operations escd_info_proc_fops = {
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.owner = THIS_MODULE,
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.open = escd_info_proc_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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};
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#define MAX_SANE_ESCD_SIZE (32*1024)
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static int proc_read_escd(char *buf, char **start, off_t pos,
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int count, int *eof, void *data)
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static int escd_proc_show(struct seq_file *m, void *v)
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{
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struct escd_info_struc escd;
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char *tmpbuf;
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int escd_size, escd_left_to_read, n;
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int escd_size;
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if (pnp_bios_escd_info(&escd))
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return -EIO;
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@ -76,7 +100,7 @@ static int proc_read_escd(char *buf, char **start, off_t pos,
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/* sanity check */
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if (escd.escd_size > MAX_SANE_ESCD_SIZE) {
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printk(KERN_ERR
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"PnPBIOS: proc_read_escd: ESCD size reported by BIOS escd_info call is too great\n");
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"PnPBIOS: %s: ESCD size reported by BIOS escd_info call is too great\n", __func__);
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return -EFBIG;
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}
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@ -94,56 +118,75 @@ static int proc_read_escd(char *buf, char **start, off_t pos,
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/* sanity check */
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if (escd_size > MAX_SANE_ESCD_SIZE) {
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printk(KERN_ERR "PnPBIOS: proc_read_escd: ESCD size reported by"
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" BIOS read_escd call is too great\n");
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printk(KERN_ERR "PnPBIOS: %s: ESCD size reported by"
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" BIOS read_escd call is too great\n", __func__);
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kfree(tmpbuf);
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return -EFBIG;
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}
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escd_left_to_read = escd_size - pos;
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if (escd_left_to_read < 0)
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escd_left_to_read = 0;
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if (escd_left_to_read == 0)
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*eof = 1;
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n = min(count, escd_left_to_read);
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memcpy(buf, tmpbuf + pos, n);
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seq_write(m, tmpbuf, escd_size);
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kfree(tmpbuf);
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*start = buf;
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return n;
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return 0;
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}
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static int proc_read_legacyres(char *buf, char **start, off_t pos,
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int count, int *eof, void *data)
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static int escd_proc_open(struct inode *inode, struct file *file)
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{
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/* Assume that the following won't overflow the buffer */
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if (pnp_bios_get_stat_res(buf))
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return -EIO;
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return count; // FIXME: Return actual length
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return single_open(file, escd_proc_show, NULL);
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}
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static int proc_read_devices(char *buf, char **start, off_t pos,
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int count, int *eof, void *data)
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static const struct file_operations escd_proc_fops = {
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.owner = THIS_MODULE,
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.open = escd_proc_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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};
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static int pnp_legacyres_proc_show(struct seq_file *m, void *v)
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{
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void *buf;
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buf = kmalloc(65536, GFP_KERNEL);
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if (!buf)
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return -ENOMEM;
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if (pnp_bios_get_stat_res(buf)) {
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kfree(buf);
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return -EIO;
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}
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seq_write(m, buf, 65536);
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kfree(buf);
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return 0;
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}
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static int pnp_legacyres_proc_open(struct inode *inode, struct file *file)
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{
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return single_open(file, pnp_legacyres_proc_show, NULL);
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}
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static const struct file_operations pnp_legacyres_proc_fops = {
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.owner = THIS_MODULE,
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.open = pnp_legacyres_proc_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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};
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static int pnp_devices_proc_show(struct seq_file *m, void *v)
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{
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struct pnp_bios_node *node;
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u8 nodenum;
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char *p = buf;
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if (pos >= 0xff)
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return 0;
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node = kzalloc(node_info.max_node_size, GFP_KERNEL);
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if (!node)
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return -ENOMEM;
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for (nodenum = pos; nodenum < 0xff;) {
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for (nodenum = 0; nodenum < 0xff;) {
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u8 thisnodenum = nodenum;
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/* 26 = the number of characters per line sprintf'ed */
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if ((p - buf + 26) > count)
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break;
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if (pnp_bios_get_dev_node(&nodenum, PNPMODE_DYNAMIC, node))
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break;
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p += sprintf(p, "%02x\t%08x\t%02x:%02x:%02x\t%04x\n",
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seq_printf(m, "%02x\t%08x\t%02x:%02x:%02x\t%04x\n",
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node->handle, node->eisa_id,
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node->type_code[0], node->type_code[1],
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node->type_code[2], node->flags);
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@ -153,20 +196,29 @@ static int proc_read_devices(char *buf, char **start, off_t pos,
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"PnPBIOS: proc_read_devices:",
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(unsigned int)nodenum,
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(unsigned int)thisnodenum);
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*eof = 1;
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break;
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}
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}
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kfree(node);
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if (nodenum == 0xff)
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*eof = 1;
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*start = (char *)((off_t) nodenum - pos);
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return p - buf;
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return 0;
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}
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static int proc_read_node(char *buf, char **start, off_t pos,
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int count, int *eof, void *data)
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static int pnp_devices_proc_open(struct inode *inode, struct file *file)
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{
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return single_open(file, pnp_devices_proc_show, NULL);
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}
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static const struct file_operations pnp_devices_proc_fops = {
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.owner = THIS_MODULE,
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.open = pnp_devices_proc_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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};
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static int pnpbios_proc_show(struct seq_file *m, void *v)
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{
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void *data = m->private;
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struct pnp_bios_node *node;
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int boot = (long)data >> 8;
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u8 nodenum = (long)data;
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@ -180,14 +232,20 @@ static int proc_read_node(char *buf, char **start, off_t pos,
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return -EIO;
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}
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len = node->size - sizeof(struct pnp_bios_node);
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memcpy(buf, node->data, len);
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seq_write(m, node->data, len);
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kfree(node);
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return len;
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return 0;
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}
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static int proc_write_node(struct file *file, const char __user * buf,
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unsigned long count, void *data)
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static int pnpbios_proc_open(struct inode *inode, struct file *file)
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{
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return single_open(file, pnpbios_proc_show, PDE(inode)->data);
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}
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static ssize_t pnpbios_proc_write(struct file *file, const char __user *buf,
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size_t count, loff_t *pos)
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{
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void *data = PDE(file->f_path.dentry->d_inode)->data;
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struct pnp_bios_node *node;
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int boot = (long)data >> 8;
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u8 nodenum = (long)data;
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@ -218,34 +276,33 @@ out:
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return ret;
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}
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static const struct file_operations pnpbios_proc_fops = {
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.owner = THIS_MODULE,
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.open = pnpbios_proc_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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.write = pnpbios_proc_write,
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};
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int pnpbios_interface_attach_device(struct pnp_bios_node *node)
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{
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char name[3];
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struct proc_dir_entry *ent;
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sprintf(name, "%02x", node->handle);
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if (!proc_pnp)
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return -EIO;
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if (!pnpbios_dont_use_current_config) {
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ent = create_proc_entry(name, 0, proc_pnp);
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if (ent) {
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ent->read_proc = proc_read_node;
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ent->write_proc = proc_write_node;
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ent->data = (void *)(long)(node->handle);
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}
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proc_create_data(name, 0644, proc_pnp, &pnpbios_proc_fops,
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(void *)(long)(node->handle));
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}
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if (!proc_pnp_boot)
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return -EIO;
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ent = create_proc_entry(name, 0, proc_pnp_boot);
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if (ent) {
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ent->read_proc = proc_read_node;
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ent->write_proc = proc_write_node;
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ent->data = (void *)(long)(node->handle + 0x100);
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if (proc_create_data(name, 0644, proc_pnp_boot, &pnpbios_proc_fops,
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(void *)(long)(node->handle + 0x100)))
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return 0;
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}
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return -EIO;
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}
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@ -262,14 +319,11 @@ int __init pnpbios_proc_init(void)
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proc_pnp_boot = proc_mkdir("boot", proc_pnp);
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if (!proc_pnp_boot)
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return -EIO;
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create_proc_read_entry("devices", 0, proc_pnp, proc_read_devices, NULL);
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create_proc_read_entry("configuration_info", 0, proc_pnp,
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proc_read_pnpconfig, NULL);
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create_proc_read_entry("escd_info", 0, proc_pnp, proc_read_escdinfo,
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NULL);
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create_proc_read_entry("escd", S_IRUSR, proc_pnp, proc_read_escd, NULL);
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create_proc_read_entry("legacy_device_resources", 0, proc_pnp,
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proc_read_legacyres, NULL);
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proc_create("devices", 0, proc_pnp, &pnp_devices_proc_fops);
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proc_create("configuration_info", 0, proc_pnp, &pnpconfig_proc_fops);
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proc_create("escd_info", 0, proc_pnp, &escd_info_proc_fops);
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proc_create("escd", S_IRUSR, proc_pnp, &escd_proc_fops);
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proc_create("legacy_device_resources", 0, proc_pnp, &pnp_legacyres_proc_fops);
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return 0;
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}
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