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| author | Rafael J. Wysocki <rjw@sisk.pl> | 2012-03-29 01:29:45 +0400 |
|---|---|---|
| committer | Rafael J. Wysocki <rjw@sisk.pl> | 2012-03-29 01:29:45 +0400 |
| commit | fe2e39d8782d885755139304d8dba0b3e5bfa878 (patch) | |
| tree | 200fb998fe94b9ccd93d07c59656b8f5ab62c5d7 /drivers | |
| parent | 9a4768d849d28a79566aa37de19b9852d2da8ec4 (diff) | |
| download | linux-fe2e39d8782d885755139304d8dba0b3e5bfa878.tar.xz | |
firmware_class: Rework usermodehelper check
Instead of two functions, read_lock_usermodehelper() and
usermodehelper_is_disabled(), used in combination, introduce
usermodehelper_read_trylock() that will only return with umhelper_sem
held if usermodehelper_disabled is unset (and will return -EAGAIN
otherwise) and make _request_firmware() use it.
Rename read_unlock_usermodehelper() to
usermodehelper_read_unlock() to follow the naming convention of the
new function.
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: stable@vger.kernel.org
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/base/firmware_class.c | 11 |
1 files changed, 5 insertions, 6 deletions
diff --git a/drivers/base/firmware_class.c b/drivers/base/firmware_class.c index 6c9387d646ec..deee871e509c 100644 --- a/drivers/base/firmware_class.c +++ b/drivers/base/firmware_class.c @@ -533,12 +533,10 @@ static int _request_firmware(const struct firmware **firmware_p, return 0; } - read_lock_usermodehelper(); - - if (WARN_ON(usermodehelper_is_disabled())) { + retval = usermodehelper_read_trylock(); + if (WARN_ON(retval)) { dev_err(device, "firmware: %s will not be loaded\n", name); - retval = -EBUSY; - goto out; + goto out_nolock; } if (uevent) @@ -573,8 +571,9 @@ static int _request_firmware(const struct firmware **firmware_p, fw_destroy_instance(fw_priv); out: - read_unlock_usermodehelper(); + usermodehelper_read_unlock(); +out_nolock: if (retval) { release_firmware(firmware); *firmware_p = NULL; |