When dynamic clk gating feature is enabled, delayed workqueue machanism is used in order to detect certain period of inactivity. But there is no guarantee that scheduled gating work is completed before module unloading. So it can cause kernel crash by accessing memory after it was freed. Fix it by cancelling clk gating and ungating works and ensure that its execution is finished before module unloading. Signed-off-by: Akinobu Mita <mita@xxxxxxxxxxxx> Cc: Vinayak Holikatti <vinholikatti@xxxxxxxxx> Cc: Dolev Raviv <draviv@xxxxxxxxxxxxxx> Cc: Subhash Jadavani <subhashj@xxxxxxxxxxxxxx> Cc: Yaniv Gardi <ygardi@xxxxxxxxxxxxxx> Cc: Sujit Reddy Thumma <sthumma@xxxxxxxxxxxxxx> Cc: Maya Erez <merez@xxxxxxxxxxxxxx> Cc: Sahitya Tummala <stummala@xxxxxxxxxxxxxx> Cc: Christoph Hellwig <hch@xxxxxx> Cc: "James E.J. Bottomley" <JBottomley@xxxxxxxxxxxxx> Cc: linux-scsi@xxxxxxxxxxxxxxx --- drivers/scsi/ufs/ufshcd.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index d18adc4..713420b 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -744,6 +744,8 @@ static void ufshcd_exit_clk_gating(struct ufs_hba *hba) if (!ufshcd_is_clkgating_allowed(hba)) return; device_remove_file(hba->dev, &hba->clk_gating.delay_attr); + cancel_work_sync(&hba->clk_gating.ungate_work); + cancel_delayed_work_sync(&hba->clk_gating.gate_work); } /* Must be called with host lock acquired */ -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
