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Commit 94eae105 authored by Ziqi Chen's avatar Ziqi Chen
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scsi: ufs: Fix imbalanced scsi_block_reqs_cnt caused by ufshcd_hold() 



The scsi_block_reqs_cnt increased in ufshcd_hold() is supposed to be
decreased back in ufshcd_ungate_work() in a paired way. However, if
specific ufshcd_hold/release sequences are met, it is possible that
scsi_block_reqs_cnt is increased twice but only one ungate work is
queued. To make sure scsi_block_reqs_cnt is handled by ufshcd_hold() and
ufshcd_ungate_work() in a paired way, increase it only if queue_work()
returns true.

Change-Id: I35f870e49cc832bb6f4b58763e3240f05b98ec13
Signed-off-by: default avatarCan Guo <cang@codeaurora.org>
Signed-off-by: default avatarZiqi Chen <ziqichen@codeaurora.org>
parent f88a5347

drivers/scsi/ufs/ufshcd.c

+3 −3
Original line number Diff line number Diff line
@@ -2241,12 +2241,12 @@ int ufshcd_hold(struct ufs_hba *hba, bool async) 
		 * work and to enable clocks.

		 */

	case CLKS_OFF:

		ufshcd_scsi_block_requests(hba);

		hba->clk_gating.state = REQ_CLKS_ON;

		trace_ufshcd_clk_gating(dev_name(hba->dev),

					hba->clk_gating.state);

		queue_work(hba->clk_gating.clk_gating_workq,

			   &hba->clk_gating.ungate_work);

		if (queue_work(hba->clk_gating.clk_gating_workq,

			       &hba->clk_gating.ungate_work))

			ufshcd_scsi_block_requests(hba);

		/*

		 * fall through to check if we should wait for this

		 * work to be done or not.