Messages in this thread | | | From | Geert Uytterhoeven <> | Date | Wed, 24 Feb 2021 12:35:37 +0100 | Subject | Re: [PATCH] video: fbdev: pm2fb: avoid stall on fb_sync |
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Hi Tong,
On Sun, Feb 21, 2021 at 1:05 AM Tong Zhang <ztong0001@gmail.com> wrote: > On Sat, Feb 20, 2021 at 6:33 PM Randy Dunlap <rdunlap@infradead.org> wrote: > > On 2/20/21 3:02 PM, Tong Zhang wrote: > > > pm2fb_sync is called when doing /dev/fb read or write. > > > The original pm2fb_sync wait indefinitely on hardware flags which can > > > possibly stall kernel and make everything unresponsive. > > > Instead of waiting indefinitely, we can timeout to give user a chance to > > > get back control. > > > > Is this a real problem or theoretical? > > Does someone still use this driver? > > I currently have this problem on my machine. > I have submitted a revised patch -- which includes the console log.
Your machine is "QEMU Standard"? Can this happen on real hardware, too, or is this a deficiency in QEMU, which should be fixed there?
Gr{oetje,eeting}s,
Geert
-- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
In personal conversations with technical people, I call myself a hacker. But when I'm talking to journalists I just say "programmer" or something like that. -- Linus Torvalds
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