linux-kernel - [PATCH v1 1/1] scsi: ufs: mcq: Fix the search/wrap around logic

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <ff49c15be205135ed3ec186f3086694c02867dbd.1692149603.git.quic_nguyenb@quicinc.com>
Date:   Tue, 15 Aug 2023 18:38:29 -0700
From:   "Bao D. Nguyen" <quic_nguyenb@...cinc.com>
To:     <quic_cang@...cinc.com>, <quic_nitirawa@...cinc.com>,
        <bvanassche@....org>, <avri.altman@....com>, <beanhuo@...ron.com>,
        <stanley.chu@...iatek.com>, <adrian.hunter@...el.com>,
        <martin.petersen@...cle.com>
CC:     <linux-scsi@...r.kernel.org>,
        "Bao D. Nguyen" <quic_nguyenb@...cinc.com>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        Manivannan Sadhasivam <mani@...nel.org>,
        Asutosh Das <quic_asutoshd@...cinc.com>,
        Po-Wen Kao <powen.kao@...iatek.com>,
        Yang Li <yang.lee@...ux.alibaba.com>,
        open list <linux-kernel@...r.kernel.org>
Subject: [PATCH v1 1/1] scsi: ufs: mcq: Fix the search/wrap around logic

The search and wrap around logic in the ufshcd_mcq_sqe_search()
function does not work correctly when the hwq's queue depth
is not a power of two number. Correct it so that any queue depth
with a positive integer value within the supported range would work.

Signed-off-by: Bao D. Nguyen <quic_nguyenb@...cinc.com>
---
 drivers/ufs/core/ufs-mcq.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/ufs/core/ufs-mcq.c b/drivers/ufs/core/ufs-mcq.c
index 66a4e24..2ba8ec2 100644
--- a/drivers/ufs/core/ufs-mcq.c
+++ b/drivers/ufs/core/ufs-mcq.c
@@ -578,7 +578,6 @@ static bool ufshcd_mcq_sqe_search(struct ufs_hba *hba,
 {
 	struct ufshcd_lrb *lrbp = &hba->lrb[task_tag];
 	struct utp_transfer_req_desc *utrd;
-	u32 mask = hwq->max_entries - 1;
 	__le64  cmd_desc_base_addr;
 	bool ret = false;
 	u64 addr, match;
@@ -606,7 +605,10 @@ static bool ufshcd_mcq_sqe_search(struct ufs_hba *hba,
 			ret = true;
 			goto out;
 		}
-		sq_head_slot = (sq_head_slot + 1) & mask;
+
+		sq_head_slot++;
+		if (sq_head_slot == hwq->max_entries)
+			sq_head_slot = 0;
 	}
 
 out:
-- 
2.7.4