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uwb: avoid radio controller reset loops

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If a radio controller reset attempt occurs while a probe() or remove()
is in progress it fails and is retried endlessly, potentially preventing
the probe() or remove() from completing.

If a reset fails, sleep for a bit before retrying the reset.  This
allows the probe()/remove() to complete.

Signed-off-by: David Vrabel <david.vrabel@csr.com>
This commit is contained in:
David Vrabel 2009-08-25 16:41:06 +01:00
parent a9e75a3892
commit 0396c215f3
5 changed files with 15 additions and 16 deletions
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3
drivers/uwb/hwa-rc.c
View file

@ -887,8 +887,7 @@ static int hwarc_post_reset(struct usb_interface *iface)
struct hwarc *hwarc = usb_get_intfdata(iface);
struct uwb_rc *uwb_rc = hwarc->uwb_rc;
uwb_rc_post_reset(uwb_rc);
return 0;
return uwb_rc_post_reset(uwb_rc);
}
/** USB device ID's that we handle */

21
drivers/uwb/reset.c
View file

@ -30,6 +30,7 @@
*/
#include <linux/kernel.h>
#include <linux/err.h>
#include <linux/delay.h>
#include "uwb-internal.h"
@ -323,13 +324,15 @@ int uwbd_msg_handle_reset(struct uwb_event *evt)
dev_info(&rc->uwb_dev.dev, "resetting radio controller\n");
ret = rc->reset(rc);
if (ret) {
if (ret < 0) {
dev_err(&rc->uwb_dev.dev, "failed to reset hardware: %d\n", ret);
goto error;
}
return 0;
error:
/* Nothing can be done except try the reset again. */
/* Nothing can be done except try the reset again. Wait a bit
to avoid reset loops during probe() or remove(). */
msleep(1000);
uwb_rc_reset_all(rc);
return ret;
}
@ -368,22 +371,20 @@ void uwb_rc_pre_reset(struct uwb_rc *rc)
}
EXPORT_SYMBOL_GPL(uwb_rc_pre_reset);
void uwb_rc_post_reset(struct uwb_rc *rc)
int uwb_rc_post_reset(struct uwb_rc *rc)
{
int ret;
ret = rc->start(rc);
if (ret)
goto error;
goto out;
ret = uwb_rc_mac_addr_set(rc, &rc->uwb_dev.mac_addr);
if (ret)
goto error;
goto out;
ret = uwb_rc_dev_addr_set(rc, &rc->uwb_dev.dev_addr);
if (ret)
goto error;
return;
error:
/* Nothing can be done except try the reset again. */
uwb_rc_reset_all(rc);
goto out;
out:
return ret;
}
EXPORT_SYMBOL_GPL(uwb_rc_post_reset);

2
drivers/uwb/umc-bus.c
View file

@ -66,7 +66,7 @@ int umc_controller_reset(struct umc_dev *umc)
return -EAGAIN;
ret = device_for_each_child(parent, parent, umc_bus_pre_reset_helper);
if (ret >= 0)
device_for_each_child(parent, parent, umc_bus_post_reset_helper);
ret = device_for_each_child(parent, parent, umc_bus_post_reset_helper);
up(&parent->sem);
return ret;

3
drivers/uwb/whc-rc.c
View file

@ -443,8 +443,7 @@ static int whcrc_post_reset(struct umc_dev *umc)
struct whcrc *whcrc = umc_get_drvdata(umc);
struct uwb_rc *uwb_rc = whcrc->uwb_rc;
uwb_rc_post_reset(uwb_rc);
return 0;
return uwb_rc_post_reset(uwb_rc);
}
/* PCI device ID's that we handle [so it gets loaded] */

2
include/linux/uwb.h
View file

@ -597,7 +597,7 @@ void uwb_rc_neh_grok(struct uwb_rc *, void *, size_t);
void uwb_rc_neh_error(struct uwb_rc *, int);
void uwb_rc_reset_all(struct uwb_rc *rc);
void uwb_rc_pre_reset(struct uwb_rc *rc);
void uwb_rc_post_reset(struct uwb_rc *rc);
int uwb_rc_post_reset(struct uwb_rc *rc);
/**
* uwb_rsv_is_owner - is the owner of this reservation the RC?