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fbdev: add mutex for fb_mmap locking

Browse source 
Add a mutex to avoid a circular locking problem between the mm layer
semaphore and fbdev ioctl mutex through the fb_mmap() call.

Also, add mutex to all places where smem_start and smem_len fields change
so the mutex inside the fb_mmap() is actually used.  Changing of these
fields before calling the framebuffer_register() are not mutexed.

This is 2.6.31 material.  It removes one lockdep (fb_mmap() and
register_framebuffer()) but there is still another one (fb_release() and
register_framebuffer()).  It also cleans up handling of the smem_start and
smem_len fields used by mutexed section of the fb_mmap().

Signed-off-by: Krzysztof Helt <krzysztof.h1@wp.pl>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Krzysztof Helt 2009-06-30 11:41:29 -07:00 committed by Linus Torvalds
parent 70d6027ff2
commit 537a1bf059
16 changed files with 74 additions and 42 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

7
drivers/video/atafb.c
View file

@ -2414,7 +2414,10 @@ static int atafb_get_fix(struct fb_fix_screeninfo *fix, struct fb_info *info)
if (err)
return err;
memset(fix, 0, sizeof(struct fb_fix_screeninfo));
return fbhw->encode_fix(fix, &par);
mutex_lock(&info->mm_lock);
err = fbhw->encode_fix(fix, &par);
mutex_unlock(&info->mm_lock);
return err;
}
static int atafb_get_var(struct fb_var_screeninfo *var, struct fb_info *info)
@ -2743,7 +2746,9 @@ static int atafb_set_par(struct fb_info *info)
/* Decode wanted screen parameters */
fbhw->decode_var(&info->var, par);
mutex_lock(&info->mm_lock);
fbhw->encode_fix(&info->fix, par);
mutex_unlock(&info->mm_lock);
/* Set new videomode */
ata_set_par(par);

2
drivers/video/atmel_lcdfb.c
View file

@ -270,7 +270,9 @@ static int atmel_lcdfb_alloc_video_memory(struct atmel_lcdfb_info *sinfo)
smem_len = (var->xres_virtual * var->yres_virtual
* ((var->bits_per_pixel + 7) / 8));
mutex_lock(&info->mm_lock);
info->fix.smem_len = max(smem_len, sinfo->smem_len);
mutex_unlock(&info->mm_lock);
info->screen_base = dma_alloc_writecombine(info->device, info->fix.smem_len,
(dma_addr_t *)&info->fix.smem_start, GFP_KERNEL);

13
drivers/video/fbmem.c
View file

@ -1310,8 +1310,6 @@ static long fb_compat_ioctl(struct file *file, unsigned int cmd,
static int
fb_mmap(struct file *file, struct vm_area_struct * vma)
__acquires(&info->lock)
__releases(&info->lock)
{
int fbidx = iminor(file->f_path.dentry->d_inode);
struct fb_info *info = registered_fb[fbidx];
@ -1325,16 +1323,14 @@ __releases(&info->lock)
off = vma->vm_pgoff << PAGE_SHIFT;
if (!fb)
return -ENODEV;
mutex_lock(&info->mm_lock);
if (fb->fb_mmap) {
int res;
mutex_lock(&info->lock);
res = fb->fb_mmap(info, vma);
mutex_unlock(&info->lock);
mutex_unlock(&info->mm_lock);
return res;
}
mutex_lock(&info->lock);
/* frame buffer memory */
start = info->fix.smem_start;
len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.smem_len);
@ -1342,13 +1338,13 @@ __releases(&info->lock)
/* memory mapped io */
off -= len;
if (info->var.accel_flags) {
mutex_unlock(&info->lock);
mutex_unlock(&info->mm_lock);
return -EINVAL;
}
start = info->fix.mmio_start;
len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.mmio_len);
}
mutex_unlock(&info->lock);
mutex_unlock(&info->mm_lock);
start &= PAGE_MASK;
if ((vma->vm_end - vma->vm_start + off) > len)
return -EINVAL;
@ -1518,6 +1514,7 @@ register_framebuffer(struct fb_info *fb_info)
break;
fb_info->node = i;
mutex_init(&fb_info->lock);
mutex_init(&fb_info->mm_lock);
fb_info->dev = device_create(fb_class, fb_info->device,
MKDEV(FB_MAJOR, i), NULL, "fb%d", i);

14
drivers/video/fsl-diu-fb.c
View file

@ -750,24 +750,26 @@ static void update_lcdc(struct fb_info *info)
static int map_video_memory(struct fb_info *info)
{
phys_addr_t phys;
u32 smem_len = info->fix.line_length * info->var.yres_virtual;
pr_debug("info->var.xres_virtual = %d\n", info->var.xres_virtual);
pr_debug("info->var.yres_virtual = %d\n", info->var.yres_virtual);
pr_debug("info->fix.line_length = %d\n", info->fix.line_length);
pr_debug("MAP_VIDEO_MEMORY: smem_len = %u\n", smem_len);
info->fix.smem_len = info->fix.line_length * info->var.yres_virtual;
pr_debug("MAP_VIDEO_MEMORY: smem_len = %d\n", info->fix.smem_len);
info->screen_base = fsl_diu_alloc(info->fix.smem_len, &phys);
info->screen_base = fsl_diu_alloc(smem_len, &phys);
if (info->screen_base == NULL) {
printk(KERN_ERR "Unable to allocate fb memory\n");
return -ENOMEM;
}
mutex_lock(&info->mm_lock);
info->fix.smem_start = (unsigned long) phys;
info->fix.smem_len = smem_len;
mutex_unlock(&info->mm_lock);
info->screen_size = info->fix.smem_len;
pr_debug("Allocated fb @ paddr=0x%08lx, size=%d.\n",
info->fix.smem_start,
info->fix.smem_len);
info->fix.smem_start, info->fix.smem_len);
pr_debug("screen base %p\n", info->screen_base);
return 0;
@ -776,9 +778,11 @@ static int map_video_memory(struct fb_info *info)
static void unmap_video_memory(struct fb_info *info)
{
fsl_diu_free(info->screen_base, info->fix.smem_len);
mutex_lock(&info->mm_lock);
info->screen_base = NULL;
info->fix.smem_start = 0;
info->fix.smem_len = 0;
mutex_unlock(&info->mm_lock);
}
/*

2
drivers/video/i810/i810_main.c
View file

@ -1090,8 +1090,10 @@ static int encode_fix(struct fb_fix_screeninfo *fix, struct fb_info *info)
memset(fix, 0, sizeof(struct fb_fix_screeninfo));
strcpy(fix->id, "I810");
mutex_lock(&info->mm_lock);
fix->smem_start = par->fb.physical;
fix->smem_len = par->fb.size;
mutex_unlock(&info->mm_lock);
fix->type = FB_TYPE_PACKED_PIXELS;
fix->type_aux = 0;
fix->xpanstep = 8;

3
drivers/video/matrox/matroxfb_base.c
View file

@ -724,8 +724,10 @@ static void matroxfb_update_fix(WPMINFO2)
struct fb_fix_screeninfo *fix = &ACCESS_FBINFO(fbcon).fix;
DBG(__func__)
mutex_lock(&ACCESS_FBINFO(fbcon).mm_lock);
fix->smem_start = ACCESS_FBINFO(video.base) + ACCESS_FBINFO(curr.ydstorg.bytes);
fix->smem_len = ACCESS_FBINFO(video.len_usable) - ACCESS_FBINFO(curr.ydstorg.bytes);
mutex_unlock(&ACCESS_FBINFO(fbcon).mm_lock);
}
static int matroxfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
@ -2081,6 +2083,7 @@ static int matroxfb_probe(struct pci_dev* pdev, const struct pci_device_id* dumm
spin_lock_init(&ACCESS_FBINFO(lock.accel));
init_rwsem(&ACCESS_FBINFO(crtc2.lock));
init_rwsem(&ACCESS_FBINFO(altout.lock));
mutex_init(&ACCESS_FBINFO(fbcon).mm_lock);
ACCESS_FBINFO(irq_flags) = 0;
init_waitqueue_head(&ACCESS_FBINFO(crtc1.vsync.wait));
init_waitqueue_head(&ACCESS_FBINFO(crtc2.vsync.wait));

5
drivers/video/matrox/matroxfb_crtc2.c
View file

@ -289,13 +289,16 @@ static int matroxfb_dh_release(struct fb_info* info, int user) {
#undef m2info
}
static void matroxfb_dh_init_fix(struct matroxfb_dh_fb_info *m2info) {
static void matroxfb_dh_init_fix(struct matroxfb_dh_fb_info *m2info)
{
struct fb_fix_screeninfo *fix = &m2info->fbcon.fix;
strcpy(fix->id, "MATROX DH");
mutex_lock(&m2info->fbcon.mm_lock);
fix->smem_start = m2info->video.base;
fix->smem_len = m2info->video.len_usable;
mutex_unlock(&m2info->fbcon.mm_lock);
fix->ypanstep = 1;
fix->ywrapstep = 0;
fix->xpanstep = 8; /* TBD */

17
drivers/video/mx3fb.c
View file

@ -669,7 +669,7 @@ static uint32_t bpp_to_pixfmt(int bpp)
}
static int mx3fb_blank(int blank, struct fb_info *fbi);
static int mx3fb_map_video_memory(struct fb_info *fbi);
static int mx3fb_map_video_memory(struct fb_info *fbi, unsigned int mem_len);
static int mx3fb_unmap_video_memory(struct fb_info *fbi);
/**
@ -742,8 +742,7 @@ static int mx3fb_set_par(struct fb_info *fbi)
if (fbi->fix.smem_start)
mx3fb_unmap_video_memory(fbi);
fbi->fix.smem_len = mem_len;
if (mx3fb_map_video_memory(fbi) < 0) {
if (mx3fb_map_video_memory(fbi, mem_len) < 0) {
mutex_unlock(&mx3_fbi->mutex);
return -ENOMEM;
}
@ -1198,6 +1197,7 @@ static int mx3fb_resume(struct platform_device *pdev)
/**
* mx3fb_map_video_memory() - allocates the DRAM memory for the frame buffer.
* @fbi: framebuffer information pointer
* @mem_len: length of mapped memory
* @return: Error code indicating success or failure
*
* This buffer is remapped into a non-cached, non-buffered, memory region to
@ -1205,23 +1205,26 @@ static int mx3fb_resume(struct platform_device *pdev)
* area is remapped, all virtual memory access to the video memory should occur
* at the new region.
*/
static int mx3fb_map_video_memory(struct fb_info *fbi)
static int mx3fb_map_video_memory(struct fb_info *fbi, unsigned int mem_len)
{
int retval = 0;
dma_addr_t addr;
fbi->screen_base = dma_alloc_writecombine(fbi->device,
fbi->fix.smem_len,
mem_len,
&addr, GFP_DMA);
if (!fbi->screen_base) {
dev_err(fbi->device, "Cannot allocate %u bytes framebuffer memory\n",
fbi->fix.smem_len);
mem_len);
retval = -EBUSY;
goto err0;
}
mutex_lock(&fbi->mm_lock);
fbi->fix.smem_start = addr;
fbi->fix.smem_len = mem_len;
mutex_unlock(&fbi->mm_lock);
dev_dbg(fbi->device, "allocated fb @ p=0x%08x, v=0x%p, size=%d.\n",
(uint32_t) fbi->fix.smem_start, fbi->screen_base, fbi->fix.smem_len);
@ -1251,8 +1254,10 @@ static int mx3fb_unmap_video_memory(struct fb_info *fbi)
fbi->screen_base, fbi->fix.smem_start);
fbi->screen_base = 0;
mutex_lock(&fbi->mm_lock);
fbi->fix.smem_start = 0;
fbi->fix.smem_len = 0;
mutex_unlock(&fbi->mm_lock);
return 0;
}

4
drivers/video/omap/omapfb_main.c
View file

@ -393,8 +393,10 @@ static void set_fb_fix(struct fb_info *fbi)
rg = &plane->fbdev->mem_desc.region[plane->idx];
fbi->screen_base = rg->vaddr;
mutex_lock(&fbi->mm_lock);
fix->smem_start = rg->paddr;
fix->smem_len = rg->size;
mutex_unlock(&fbi->mm_lock);
fix->type = FB_TYPE_PACKED_PIXELS;
bpp = var->bits_per_pixel;
@ -886,8 +888,10 @@ static int omapfb_setup_mem(struct fb_info *fbi, struct omapfb_mem_info *mi)
* plane memory is dealloce'd, the other
* screen parameters in var / fix are invalid.
*/
mutex_lock(&fbi->mm_lock);
fbi->fix.smem_start = 0;
fbi->fix.smem_len = 0;
mutex_unlock(&fbi->mm_lock);
}
}
}

2
drivers/video/platinumfb.c
View file

@ -141,7 +141,9 @@ static int platinumfb_set_par (struct fb_info *info)
offset = 0x10;
info->screen_base = pinfo->frame_buffer + init->fb_offset + offset;
mutex_lock(&info->mm_lock);
info->fix.smem_start = (pinfo->frame_buffer_phys) + init->fb_offset + offset;
mutex_unlock(&info->mm_lock);
info->fix.visual = (pinfo->cmode == CMODE_8) ?
FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_DIRECTCOLOR;
info->fix.line_length = vmode_attrs[pinfo->vmode-1].hres * (1<<pinfo->cmode)

2
drivers/video/pxafb.c
View file

@ -815,8 +815,10 @@ static int overlayfb_map_video_memory(struct pxafb_layer *ofb)
ofb->video_mem_phys = virt_to_phys(ofb->video_mem);
ofb->video_mem_size = size;
mutex_lock(&ofb->fb.mm_lock);
ofb->fb.fix.smem_start = ofb->video_mem_phys;
ofb->fb.fix.smem_len = ofb->fb.fix.line_length * var->yres_virtual;
mutex_unlock(&ofb->fb.mm_lock);
ofb->fb.screen_base = ofb->video_mem;
return 0;
}

19
drivers/video/sh7760fb.c
View file

@ -120,18 +120,6 @@ static int sh7760_setcolreg (u_int regno,
return 0;
}
static void encode_fix(struct fb_fix_screeninfo *fix, struct fb_info *info,
unsigned long stride)
{
memset(fix, 0, sizeof(struct fb_fix_screeninfo));
strcpy(fix->id, "sh7760-lcdc");
fix->smem_start = (unsigned long)info->screen_base;
fix->smem_len = info->screen_size;
fix->line_length = stride;
}
static int sh7760fb_get_color_info(struct device *dev,
u16 lddfr, int *bpp, int *gray)
{
@ -334,7 +322,8 @@ static int sh7760fb_set_par(struct fb_info *info)
iowrite32(ldsarl, par->base + LDSARL); /* mem for lower half of DSTN */
encode_fix(&info->fix, info, stride);
info->fix.line_length = stride;
sh7760fb_check_var(&info->var, info);
sh7760fb_blank(FB_BLANK_UNBLANK, info); /* panel on! */
@ -435,6 +424,8 @@ static int sh7760fb_alloc_mem(struct fb_info *info)
info->screen_base = fbmem;
info->screen_size = vram;
info->fix.smem_start = (unsigned long)info->screen_base;
info->fix.smem_len = info->screen_size;
return 0;
}
@ -520,6 +511,8 @@ static int __devinit sh7760fb_probe(struct platform_device *pdev)
info->var.transp.length = 0;
info->var.transp.msb_right = 0;
strcpy(info->fix.id, "sh7760-lcdc");
/* set the DON2 bit now, before cmap allocation, as it will randomize
* palette memory.
*/

2
drivers/video/sis/sis_main.c
View file

@ -1847,8 +1847,10 @@ sisfb_get_fix(struct fb_fix_screeninfo *fix, int con, struct fb_info *info)
strcpy(fix->id, ivideo->myid);
mutex_lock(&info->mm_lock);
fix->smem_start = ivideo->video_base + ivideo->video_offset;
fix->smem_len = ivideo->sisfb_mem;
mutex_unlock(&info->mm_lock);
fix->type = FB_TYPE_PACKED_PIXELS;
fix->type_aux = 0;
fix->visual = (ivideo->video_bpp == 8) ? FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_TRUECOLOR;

21
drivers/video/sm501fb.c
View file

@ -145,7 +145,7 @@ static inline void sm501fb_sync_regs(struct sm501fb_info *info)
#define SM501_MEMF_ACCEL (8)
static int sm501_alloc_mem(struct sm501fb_info *inf, struct sm501_mem *mem,
unsigned int why, size_t size)
unsigned int why, size_t size, u32 smem_len)
{
struct sm501fb_par *par;
struct fb_info *fbi;
@ -172,7 +172,7 @@ static int sm501_alloc_mem(struct sm501fb_info *inf, struct sm501_mem *mem,
if (ptr > 0)
ptr &= ~(PAGE_SIZE - 1);
if (fbi && ptr < fbi->fix.smem_len)
if (fbi && ptr < smem_len)
return -ENOMEM;
break;
@ -197,7 +197,7 @@ static int sm501_alloc_mem(struct sm501fb_info *inf, struct sm501_mem *mem,
case SM501_MEMF_ACCEL:
fbi = inf->fb[HEAD_CRT];
ptr = fbi ? fbi->fix.smem_len : 0;
ptr = fbi ? smem_len : 0;
fbi = inf->fb[HEAD_PANEL];
if (fbi) {
@ -413,6 +413,7 @@ static int sm501fb_set_par_common(struct fb_info *info,
unsigned int mem_type;
unsigned int clock_type;
unsigned int head_addr;
unsigned int smem_len;
dev_dbg(fbi->dev, "%s: %dx%d, bpp = %d, virtual %dx%d\n",
__func__, var->xres, var->yres, var->bits_per_pixel,
@ -453,18 +454,20 @@ static int sm501fb_set_par_common(struct fb_info *info,
/* allocate fb memory within 501 */
info->fix.line_length = (var->xres_virtual * var->bits_per_pixel)/8;
info->fix.smem_len = info->fix.line_length * var->yres_virtual;
smem_len = info->fix.line_length * var->yres_virtual;
dev_dbg(fbi->dev, "%s: line length = %u\n", __func__,
info->fix.line_length);
if (sm501_alloc_mem(fbi, &par->screen, mem_type,
info->fix.smem_len)) {
if (sm501_alloc_mem(fbi, &par->screen, mem_type, smem_len, smem_len)) {
dev_err(fbi->dev, "no memory available\n");
return -ENOMEM;
}
mutex_lock(&info->mm_lock);
info->fix.smem_start = fbi->fbmem_res->start + par->screen.sm_addr;
info->fix.smem_len = smem_len;
mutex_unlock(&info->mm_lock);
info->screen_base = fbi->fbmem + par->screen.sm_addr;
info->screen_size = info->fix.smem_len;
@ -637,7 +640,8 @@ static int sm501fb_set_par_crt(struct fb_info *info)
if ((control & SM501_DC_CRT_CONTROL_SEL) == 0) {
/* the head is displaying panel data... */
sm501_alloc_mem(fbi, &par->screen, SM501_MEMF_CRT, 0);
sm501_alloc_mem(fbi, &par->screen, SM501_MEMF_CRT, 0,
info->fix.smem_len);
goto out_update;
}
@ -1289,7 +1293,8 @@ static int sm501_init_cursor(struct fb_info *fbi, unsigned int reg_base)
par->cursor_regs = info->regs + reg_base;
ret = sm501_alloc_mem(info, &par->cursor, SM501_MEMF_CURSOR, 1024);
ret = sm501_alloc_mem(info, &par->cursor, SM501_MEMF_CURSOR, 1024,
fbi->fix.smem_len);
if (ret < 0)
return ret;

2
drivers/video/w100fb.c
View file

@ -523,6 +523,7 @@ static int w100fb_set_par(struct fb_info *info)
info->fix.ywrapstep = 0;
info->fix.line_length = par->xres * BITS_PER_PIXEL / 8;
mutex_lock(&info->mm_lock);
if ((par->xres*par->yres*BITS_PER_PIXEL/8) > (MEM_INT_SIZE+1)) {
par->extmem_active = 1;
info->fix.smem_len = par->mach->mem->size+1;
@ -530,6 +531,7 @@ static int w100fb_set_par(struct fb_info *info)
par->extmem_active = 0;
info->fix.smem_len = MEM_INT_SIZE+1;
}
mutex_unlock(&info->mm_lock);
w100fb_activate_var(par);
}

1
include/linux/fb.h
View file

@ -819,6 +819,7 @@ struct fb_info {
int node;
int flags;
struct mutex lock; /* Lock for open/release/ioctl funcs */
struct mutex mm_lock; /* Lock for fb_mmap and smem_* fields */
struct fb_var_screeninfo var; /* Current var */
struct fb_fix_screeninfo fix; /* Current fix */
struct fb_monspecs monspecs; /* Current Monitor specs */