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| author | Rafael J. Wysocki <rjw@sisk.pl> | 2011-05-06 20:09:42 +0200 |
|---|---|---|
| committer | Rafael J. Wysocki <rjw@sisk.pl> | 2011-05-17 23:19:17 +0200 |
| commit | a144c6a6c924aa1da04dd77fb84b89927354fdff (patch) | |
| tree | 10cab9080a722a191086f58b9f304329e8a8b942 /drivers/base/firmware_class.c | |
| parent | e1866b33b1e89f077b7132daae3dfd9a594e9a1a (diff) | |
| download | lwn-a144c6a6c924aa1da04dd77fb84b89927354fdff.tar.gz lwn-a144c6a6c924aa1da04dd77fb84b89927354fdff.zip | |
PM: Print a warning if firmware is requested when tasks are frozen
Some drivers erroneously use request_firmware() from their ->resume()
(or ->thaw(), or ->restore()) callbacks, which is not going to work
unless the firmware has been built in. This causes system resume to
stall until the firmware-loading timeout expires, which makes users
think that the resume has failed and reboot their machines
unnecessarily. For this reason, make _request_firmware() print a
warning and return immediately with error code if it has been called
when tasks are frozen and it's impossible to start any new usermode
helpers.
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Reviewed-by: Valdis Kletnieks <valdis.kletnieks@vt.edu>
Diffstat (limited to 'drivers/base/firmware_class.c')
| -rw-r--r-- | drivers/base/firmware_class.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/base/firmware_class.c b/drivers/base/firmware_class.c index 8c798ef7f13f..bbb03e6f7255 100644 --- a/drivers/base/firmware_class.c +++ b/drivers/base/firmware_class.c @@ -521,6 +521,11 @@ static int _request_firmware(const struct firmware **firmware_p, if (!firmware_p) return -EINVAL; + if (WARN_ON(usermodehelper_is_disabled())) { + dev_err(device, "firmware: %s will not be loaded\n", name); + return -EBUSY; + } + *firmware_p = firmware = kzalloc(sizeof(*firmware), GFP_KERNEL); if (!firmware) { dev_err(device, "%s: kmalloc(struct firmware) failed\n", |