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media: dvbdev: fix the logic when DVB_DYNAMIC_MINORS is not set

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commit a4aebaf6e6efff548b01a3dc49b4b9074751c15b upstream.

When CONFIG_DVB_DYNAMIC_MINORS, ret is not initialized, and a
semaphore is left at the wrong state, in case of errors.

Make the code simpler and avoid mistakes by having just one error
check logic used weather DVB_DYNAMIC_MINORS is used or not.

Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Closes: https://lore.kernel.org/r/202410201717.ULWWdJv8-lkp@intel.com/
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/9e067488d8935b8cf00959764a1fa5de85d65725.1730926254.git.mchehab+huawei@kernel.org
Cc: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mauro Carvalho Chehab 2024-11-06 21:50:55 +01:00 • committed by Ksawlii
parent a465efacba
commit 0f91fbca50
1 changed files with 4 additions and 11 deletions
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15
drivers/media/dvb-core/dvbdev.c
View file

@ -544,6 +544,9 @@ int dvb_register_device(struct dvb_adapter *adap, struct dvb_device **pdvbdev,
for (minor = 0; minor < MAX_DVB_MINORS; minor++)
if (dvb_minors[minor] == NULL)
break;
#else
minor = nums2minor(adap->num, type, id);
#endif
if (minor >= MAX_DVB_MINORS) {
if (new_node) {
list_del (&new_node->list_head);
@ -557,17 +560,7 @@ int dvb_register_device(struct dvb_adapter *adap, struct dvb_device **pdvbdev,
mutex_unlock(&dvbdev_register_lock);
return -EINVAL;
}
#else
minor = nums2minor(adap->num, type, id);
if (minor >= MAX_DVB_MINORS) {
dvb_media_device_free(dvbdev);
list_del(&dvbdev->list_head);
kfree(dvbdev);
*pdvbdev = NULL;
mutex_unlock(&dvbdev_register_lock);
return ret;
}
#endif
dvbdev->minor = minor;
dvb_minors[minor] = dvb_device_get(dvbdev);
up_write(&minor_rwsem);