The drivers vt6655 and gma500 call pci_set_power_state under a spinlock, which may sleep.
The function call paths are:
gma_power_begin (acquire the spinlock) (drivers/gpu/drm/gma500/power.c)
gma_resume_pci
pci_set_power_state
__pci_start_power_transition (drivers/pci/pci.c)
msleep --> may sleep
gma_power_begin (acquire the spinlock) (drivers/gpu/drm/gma500/power.c)
gma_resume_pci
pci_enable_device
pci_enable_device_flags (drivers/pci/pci.c)
do_pci_enable_device
pci_set_power_state
__pci_start_power_transition
msleep --> may sleep
vt6655_suspend (acquire the spinlock) (drivers/staging/vt6655/device_main.c)
pci_set_power_state
__pci_start_power_transition (drivers/pci/pci.c)
msleep --> may sleep
To fix these bugs, msleep is replaced with mdelay in __pci_start_power_transition
These bugs are found by my static analysis tool and my code review.
Signed-off-by: Jia-Ju Bai <baijiaju1990@xxxxxxx>
---
drivers/pci/pci.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 6078dfc..7b763a3 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -823,7 +823,7 @@ static void __pci_start_power_transition(struct pci_dev *dev, pci_power_t state)
*/
if (dev->runtime_d3cold) {
if (dev->d3cold_delay)
- msleep(dev->d3cold_delay);
+ mdelay(dev->d3cold_delay);
/*
* When powering on a bridge from D3cold, the
* whole hierarchy may be powered on into
--
1.7.9.5
