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authorRafael J. Wysocki <rjw@sisk.pl>2011-05-06 22:09:42 +0400
committerRafael J. Wysocki <rjw@sisk.pl>2011-05-18 01:19:17 +0400
commita144c6a6c924aa1da04dd77fb84b89927354fdff (patch)
tree10cab9080a722a191086f58b9f304329e8a8b942 /drivers/base
parente1866b33b1e89f077b7132daae3dfd9a594e9a1a (diff)
downloadlinux-a144c6a6c924aa1da04dd77fb84b89927354fdff.tar.xz
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')
-rw-r--r--drivers/base/firmware_class.c5
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",