Messages in this thread Patch in this message |  | | From | Jia-Ju Bai <> | Subject | [PATCH] video: fbdev: aty: aty128fb: Replace mdelay with msleep in aty128_set_suspend | Date | Tue, 10 Apr 2018 09:40:35 +0800 |
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aty128_set_suspend() is never called in atomic context.
The call chains ending up at aty128_set_suspend() are: [1] aty128_set_suspend() <- aty128_pci_suspend() [2] aty128_set_suspend() <- aty128_do_resume() <- aty128_pci_resume() [3] aty128_set_suspend() <- aty128_do_resume() <- aty128_early_resume()
aty128_pci_suspend() is set as ".suspend" in struct pci_driver. aty128_pci_resume() is set as ".resume" in struct pci_driver. aty128_early_resume() is never called. These functions are not called in atomic context.
Despite never getting called from atomic context, aty128_set_suspend() calls mdelay() to busily wait. This is not necessary and can be replaced with msleep() to avoid busy waiting.
This is found by a static analysis tool named DCNS written by myself. And I also manually check it.
Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com> --- drivers/video/fbdev/aty/aty128fb.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/video/fbdev/aty/aty128fb.c b/drivers/video/fbdev/aty/aty128fb.c index db18474..15dfdff 100644 --- a/drivers/video/fbdev/aty/aty128fb.c +++ b/drivers/video/fbdev/aty/aty128fb.c @@ -2442,7 +2442,7 @@ static void aty128_set_suspend(struct aty128fb_par *par, int suspend) (void)aty_ld_pll(POWER_MANAGEMENT); aty_st_le32(BUS_CNTL1, 0x00000010); aty_st_le32(MEM_POWER_MISC, 0x0c830000); - mdelay(100); + msleep(100); /* Switch PCI power management to D2 */ pci_set_power_state(pdev, PCI_D2); -- 1.9.1
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