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