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| author | Jia-Ju Bai <baijiaju1990@gmail.com> | 2018-04-24 18:11:21 +0200 |
|---|---|---|
| committer | Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com> | 2018-04-24 18:11:21 +0200 |
| commit | 86c4e7c350a5bd116ff4b9cea2c75a4a4ae321ff (patch) | |
| tree | 0f896c02bb49db86ef3e6ab2a65afddec5aeedee /drivers | |
| parent | video: fbdev: savage: Replace mdelay with usleep_range in savage_init_hw (diff) | |
| download | linux-86c4e7c350a5bd116ff4b9cea2c75a4a4ae321ff.tar.xz linux-86c4e7c350a5bd116ff4b9cea2c75a4a4ae321ff.zip | |
video: fbdev: aty: aty128fb: Replace mdelay with msleep in aty128_set_suspend
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>
Cc: Paul Mackerras <paulus@samba.org>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/video/fbdev/aty/aty128fb.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/video/fbdev/aty/aty128fb.c b/drivers/video/fbdev/aty/aty128fb.c index 09b0e558dce8..6cc46867ff57 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); |