linux-kernel - Re: [PATCH v2] scsi: ufs: mcq: Fix memory allocation checks for SQE and CQE

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Message-ID: <3fc7d28a549bf013d320cf274513090ca0403b20.camel@mediatek.com>
Date: Mon, 8 Sep 2025 12:06:20 +0000
From: Peter Wang (王信友) <peter.wang@...iatek.com>
To: "avri.altman@....com" <avri.altman@....com>, "quic_asutoshd@...cinc.com"
	<quic_asutoshd@...cinc.com>, "quic_cang@...cinc.com" <quic_cang@...cinc.com>,
	"alok.a.tiwari@...cle.com" <alok.a.tiwari@...cle.com>,
	"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
	"bvanassche@....org" <bvanassche@....org>, "alim.akhtar@...sung.com"
	<alim.akhtar@...sung.com>, "mani@...nel.org" <mani@...nel.org>,
	"martin.petersen@...cle.com" <martin.petersen@...cle.com>,
	"James.Bottomley@...senPartnership.com"
	<James.Bottomley@...senPartnership.com>
CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] scsi: ufs: mcq: Fix memory allocation checks for SQE
 and CQE

On Sun, 2025-09-07 at 12:40 -0700, Alok Tiwari wrote:
> 
> Previous checks incorrectly tested the DMA addresses (dma_handle)
> for NULL. Since dma_alloc_coherent() returns the CPU (virtual)
> address, the NULL check should be performed on the *_base_addr
> pointer to correctly detect allocation failures.
> 
> Update the checks to validate sqe_base_addr and cqe_base_addr
> instead of sqe_dma_addr and cqe_dma_addr.
> 
> Fixes: 4682abfae2eb ("scsi: ufs: core: mcq: Allocate memory for MCQ
> mode")
> Signed-off-by: Alok Tiwari <alok.a.tiwari@...cle.com>
> Reviewed-by: Alim Akhtar <alim.akhtar@...sung.com>
> ---
> v1 -> v2
> rephrase commit message and added Reviewed-by Alim
> ---
>  drivers/ufs/core/ufs-mcq.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/ufs/core/ufs-mcq.c b/drivers/ufs/core/ufs-mcq.c
> index 1e50675772fe..cc88aaa106da 100644
> --- a/drivers/ufs/core/ufs-mcq.c
> +++ b/drivers/ufs/core/ufs-mcq.c
> @@ -243,7 +243,7 @@ int ufshcd_mcq_memory_alloc(struct ufs_hba *hba)
>                 hwq->sqe_base_addr = dmam_alloc_coherent(hba->dev,
> utrdl_size,
>                                                          &hwq-
> >sqe_dma_addr,
>                                                          GFP_KERNEL);
> -               if (!hwq->sqe_dma_addr) {
> +               if (!hwq->sqe_base_addr) {
>                         dev_err(hba->dev, "SQE allocation failed\n");
>                         return -ENOMEM;
>                 }
> @@ -252,7 +252,7 @@ int ufshcd_mcq_memory_alloc(struct ufs_hba *hba)
>                 hwq->cqe_base_addr = dmam_alloc_coherent(hba->dev,
> cqe_size,
>                                                          &hwq-
> >cqe_dma_addr,
>                                                          GFP_KERNEL);
> -               if (!hwq->cqe_dma_addr) {
> +               if (!hwq->cqe_base_addr) {
>                         dev_err(hba->dev, "CQE allocation failed\n");
>                         return -ENOMEM;
>                 }
> --
> 2.50.1
> 

Reviewed-by: Peter Wang <peter.wang@...iatek.com>