linux-kernel - [PATCH v1 2/2] mmc: cavium: Remove redundant if-statement checkup

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Date:   Fri, 19 Mar 2021 13:13:57 +0100
From:   Bean Huo <huobean@...il.com>
To:     rric@...nel.org, ulf.hansson@...aro.org, linus.walleij@...aro.org,
        linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     beanhuo@...ron.com, stable@...r.kernel.org
Subject: [PATCH v1 2/2] mmc: cavium: Remove redundant if-statement checkup

From: Bean Huo <beanhuo@...ron.com>

Currently, we have two ways to issue multiple-block read/write the
command to the eMMC. One is by normal IO request path fs->block->mmc.
Another one is that we can issue multiple-block read/write through
MMC ioctl interface. For the first path, mrq->stop, and mrq->stop->opcode
will be initialized in mmc_blk_data_prep(). However, for the second IO
path, mrq->stop is not initialized since it is a pre-defined multiple
blocks read/write.

Meanwhile, if it is open-ended multiple block read/write command,
STOP_TRANSMISSION CMD12 will be issued later in mmc_blk_issue_drv_op(),
since it is MMC_IOC_MULTI_CMD.

So, delete these if-statement checkups, let these kinds of multiple-block
read/write request go.

Fixes 'ba3869ff32e4 ("mmc: cavium: Add core MMC driver for Cavium SOCs")'
Cc: stable@...r.kernel.org
Signed-off-by: Bean Huo <beanhuo@...ron.com>
---
 drivers/mmc/host/cavium.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/mmc/host/cavium.c b/drivers/mmc/host/cavium.c
index 95a41983c6c0..8fb7cbcf62ad 100644
--- a/drivers/mmc/host/cavium.c
+++ b/drivers/mmc/host/cavium.c
@@ -654,8 +654,7 @@ static void cvm_mmc_dma_request(struct mmc_host *mmc,
 	struct mmc_data *data;
 	u64 emm_dma, addr;

-	if (!mrq->data || !mrq->data->sg || !mrq->data->sg_len ||
-	    !mrq->stop || mrq->stop->opcode != MMC_STOP_TRANSMISSION) {
+	if (!mrq->data || !mrq->data->sg || !mrq->data->sg_len) {
 		dev_err(&mmc->card->dev, "Error: %s no data\n", __func__);
 		goto error;
 	}
-- 
2.25.1