From: Joe Zhou <Joe.Zhou@xxxxxxxxxxxx>
> Thanks for your patch!
> Doesn't commit 66c915d09b94 ("mmc: core: Disable card detect during
> shutdown") take care of this problem?
> Kind regards
> Uffe
Dear Ulf,
Thank you for your replay!
I think that commit66c915d09b94 ("mmc: core: Disable card detect during shutdown") doesn't reslove this issue.
1. Issues may asise in the following processing.
sdcard hot pulg out: SyS_reboot:
CPU0 CPU1
_mmc_detect_change() {
......
mmc_schedule_delayed_work(&host->detect, delay)
#Step1: call delay work &host->detect
mmc_rescan()
{
.......
#Step2: detect SD card removed
mmc_sd_detect() { ......
_mmc_stop_host (.pre_shutdown)
{
...... #Step3:_mmc_stop_host() cancel detect use sync
cancel_delayed_work_sync(&host->detect)
#Step4: wait delay work complete
}
if (err) {
#Step5: host->card is NULL
mmc_sd_remove(host); ......
#Step6: wait delay work complete
mmc_sd_suspend (.shutdown)
{
......
#Step7:_mmc_sd_suspend claimed host
mmc_claim_host(host);
#Step8: use host-card(NULL pointer)
if (mmc_card_suspended(host->card))
......
}
mmc_claim_host(host);
mmc_detach_bus(host);
}
}
}
......
}
2. And in the version that includes the patch, we have reproduced the issue.
Best regards,
Joe
