Hi
On 2024-08-01, Stefan Lippers-Hollmann wrote:
On 2024-07-30, Greg Kroah-Hartman wrote:
6.10-stable review patch. If anyone has any objections, please let me know.
From: Zheng Yejian zhengyejian1@huawei.com
[ Upstream commit 2052138b7da52ad5ccaf74f736d00f39a1c9198c ]
Infinite log printing occurs during fuzz test:
rc rc1: DViCO FusionHDTV DVB-T USB (LGZ201) as ... ... dvb-usb: schedule remote query interval to 100 msecs. dvb-usb: DViCO FusionHDTV DVB-T USB (LGZ201) successfully initialized ... dvb-usb: bulk message failed: -22 (1/0) dvb-usb: bulk message failed: -22 (1/0) dvb-usb: bulk message failed: -22 (1/0) ... dvb-usb: bulk message failed: -22 (1/0)
Looking into the codes, there is a loop in dvb_usb_read_remote_control(), that is in rc_core_dvb_usb_remote_init() create a work that will call dvb_usb_read_remote_control(), and this work will reschedule itself at 'rc_interval' intervals to recursively call dvb_usb_read_remote_control(), see following code snippet:
[...]
This patch, as part of v6.10.3-rc3 breaks my TeVii s480 dual DVB-S2 card, reverting just this patch from v6.10-rc3 fixes the situation again (a co-installed Microsoft Xbox One Digital TV DVB-T2 Tuner keeps working).
[...]
Btw. I can also reproduce this (both breakage and 'fix' by reverting this patch) on a another x86_64 system that only has a single TeVii s480 dual DVB-S2 card (and no further v4l devices) installed. So I'm seeing this on both sandy-bridge and raptor-lake x86_64 systems.
Regards Stefan Lippers-Hollmann