Hi Tian,
url: https://github.com/0day-ci/linux/commits/Tian-Tao/drm-irq-Add-irq-as-false-d... base: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 3cea11cd5e3b00d91caf0b4730194039b45c5891 config: x86_64-randconfig-m001-20201102 (attached as .config) compiler: gcc-9 (Debian 9.3.0-15) 9.3.0
If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot lkp@intel.com Reported-by: Dan Carpenter dan.carpenter@oracle.com
New smatch warnings: drivers/gpu/drm/drm_irq.c:175 drm_irq_uninstall() warn: variable dereferenced before check 'dev' (see line 175)
Old smatch warnings: drivers/gpu/drm/drm_irq.c:149 drm_irq_install() warn: 'irq' not released on lines: 133.
vim +/dev +175 drivers/gpu/drm/drm_irq.c
84b1fd103dbbe01 drivers/char/drm/drm_irq.c Dave Airlie 2007-07-11 169 int drm_irq_uninstall(struct drm_device *dev) ^1da177e4c3f415 drivers/char/drm/drm_irq.c Linus Torvalds 2005-04-16 170 { dc1336ff4fe08ae drivers/gpu/drm/drm_irq.c Jesse Barnes 2009-01-06 171 unsigned long irqflags; 4423843cde65232 drivers/gpu/drm/drm_irq.c Ville Syrjälä 2013-10-04 172 bool irq_enabled; 4423843cde65232 drivers/gpu/drm/drm_irq.c Ville Syrjälä 2013-10-04 173 int i; ^1da177e4c3f415 drivers/char/drm/drm_irq.c Linus Torvalds 2005-04-16 174 fa889e8baa5377b drivers/gpu/drm/drm_irq.c Tian Tao 2020-11-02 @175 if (!dev->irq_enabled || !dev) ^^^^^^^^^^^^^^^^^^^^^^^^^^ This is checking "dev" after dereferencing it. Can "dev" even be NULL?
fa889e8baa5377b drivers/gpu/drm/drm_irq.c Tian Tao 2020-11-02 176 return 0; fa889e8baa5377b drivers/gpu/drm/drm_irq.c Tian Tao 2020-11-02 177 ^1da177e4c3f415 drivers/char/drm/drm_irq.c Linus Torvalds 2005-04-16 178 irq_enabled = dev->irq_enabled; 4423843cde65232 drivers/gpu/drm/drm_irq.c Ville Syrjälä 2013-10-04 179 dev->irq_enabled = false; ^1da177e4c3f415 drivers/char/drm/drm_irq.c Linus Torvalds 2005-04-16 180 dc1336ff4fe08ae drivers/gpu/drm/drm_irq.c Jesse Barnes 2009-01-06 181 /* 3bff93d64cf59f0 drivers/gpu/drm/drm_irq.c Daniel Vetter 2015-02-22 182 * Wake up any waiters so they don't hang. This is just to paper over
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