linux-kernel - [PATCH 2/2] scsi: ufs: Return a bsg request immediatley if eh-in-progress

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Date:   Mon,  8 Nov 2021 14:08:04 +0200
From:   Avri Altman <avri.altman@....com>
To:     "James E . J . Bottomley" <jejb@...ux.vnet.ibm.com>,
        "Martin K . Petersen" <martin.petersen@...cle.com>
Cc:     linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        Adrian Hunter <adrian.hunter@...el.com>,
        Avri Altman <avri.altman@....com>
Subject: [PATCH 2/2] scsi: ufs: Return a bsg request immediatley if eh-in-progress

ufs-bsg is attempting to access the device from user-space, and it is
unaware of the internal driver flows, specifically if error handling is
currently ongoing.

Fixes: 5e0a86eed846 (scsi: ufs: Add API to execute raw upiu commands)

Signed-off-by: Avri Altman <avri.altman@....com>
---
 drivers/scsi/ufs/ufshcd.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 3869bb57769b..828061c05909 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -6830,6 +6830,9 @@ int ufshcd_exec_raw_upiu_cmd(struct ufs_hba *hba,
 	enum utp_ocs ocs_value;
 	u8 tm_f = be32_to_cpu(req_upiu->header.dword_1) >> 16 & MASK_TM_FUNC;
 
+	if (!ufshcd_is_user_access_allowed(hba))
+		return -EBUSY;
+
 	switch (msgcode) {
 	case UPIU_TRANSACTION_NOP_OUT:
 		cmd_type = DEV_CMD_TYPE_NOP;
-- 
2.17.1