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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 | 12f3ac2fb16130e4afcfde986fb97f61cb54eead (patch) | |
| tree | db106f43cf3d6f26be808c93913e02e0108b615a /drivers | |
| parent | Merge tag 'v4.17-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/torval... (diff) | |
| download | linux-12f3ac2fb16130e4afcfde986fb97f61cb54eead.tar.xz linux-12f3ac2fb16130e4afcfde986fb97f61cb54eead.zip | |
video: fbdev: savage: Replace mdelay with usleep_range in savage_init_hw
savage_init_hw() is never called in atomic context.
The call chains ending up at savage_init_hw() are:
[1] savage_init_hw() <- savagefb_probe()
[2] savage_init_hw() <- savagefb_resume()
savagefb_probe() is only set as ".probe" in struct pci_driver.
savagefb_resume) is only set as ".resume" in struct pci_driver.
These functions are not called in atomic context.
Despite never getting called from atomic context, savage_init_hw()
calls mdelay() to busily wait.
This is not necessary and can be replaced with usleep_range 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: Antonino Daplas <adaplas@gmail.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/video/fbdev/savage/savagefb_driver.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/video/fbdev/savage/savagefb_driver.c b/drivers/video/fbdev/savage/savagefb_driver.c index c20468362f11..c09d7426cd92 100644 --- a/drivers/video/fbdev/savage/savagefb_driver.c +++ b/drivers/video/fbdev/savage/savagefb_driver.c @@ -1892,11 +1892,11 @@ static int savage_init_hw(struct savagefb_par *par) vga_out8(0x3d4, 0x66, par); cr66 = vga_in8(0x3d5, par); vga_out8(0x3d5, cr66 | 0x02, par); - mdelay(10); + usleep_range(10000, 11000); vga_out8(0x3d4, 0x66, par); vga_out8(0x3d5, cr66 & ~0x02, par); /* clear reset flag */ - mdelay(10); + usleep_range(10000, 11000); /* @@ -1906,11 +1906,11 @@ static int savage_init_hw(struct savagefb_par *par) vga_out8(0x3d4, 0x3f, par); cr3f = vga_in8(0x3d5, par); vga_out8(0x3d5, cr3f | 0x08, par); - mdelay(10); + usleep_range(10000, 11000); vga_out8(0x3d4, 0x3f, par); vga_out8(0x3d5, cr3f & ~0x08, par); /* clear reset flags */ - mdelay(10); + usleep_range(10000, 11000); /* Savage ramdac speeds */ par->numClocks = 4; |