linux-kernel - [PATCH] mmc: block: remove non-data R1B ioctl workaround

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Message-ID: <dd632a86fb924b019d1a009b17eb3cbc@hyperstone.com>
Date:   Wed, 23 Nov 2022 17:38:56 +0000
From:   Christian Löhle <CLoehle@...erstone.com>
To:     "adrian.hunter@...el.com" <adrian.hunter@...el.com>,
        "ulf.hansson@...aro.org" <ulf.hansson@...aro.org>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     Avri Altman <Avri.Altman@....com>
Subject: [PATCH] mmc: block: remove non-data R1B ioctl workaround

The workaround of pretending R1B non-data transfers are
data transfers in order for the busy timeout to be respected
by the host controller driver is removed. It wasn't useful
in a long time.

Initially the workaround ensured that R1B commands did not
time out by setting the data timeout to be the command timeout
in commit cb87ea28ed9e ("mmc: core: Add mmc CMD+ACMD passthrough ioctl").
This was moved inside of an if clause with idata->buf_bytes being set
in commit 4d6144de8ba2 ("mmc: core: check for zero length ioctl data").
This patch intends to fix the issuing of R1B data command CMD24.
Its data timeout was being overwritten with 0 because cmd_timeout
wasn't set at the point the workaround applied, but data_timeout was.
But since the workaround was now inside of the idata->buf_bytes clause
and intended to fix R1B non-data transfers that do not have buf_bytes
set we can also remove the workaround altogether.

Fixes: cb87ea28ed9e ("mmc: core: Add mmc CMD+ACMD passthrough ioctl")
Signed-off-by: Christian Loehle <cloehle@...erstone.com>
---
 drivers/mmc/core/block.c | 13 -------------
 1 file changed, 13 deletions(-)

diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c
index db6d8a099910..20da7ed43e6d 100644
--- a/drivers/mmc/core/block.c
+++ b/drivers/mmc/core/block.c
@@ -514,19 +514,6 @@ static int __mmc_blk_ioctl_cmd(struct mmc_card *card, struct mmc_blk_data *md,
 		if (idata->ic.data_timeout_ns)
 			data.timeout_ns = idata->ic.data_timeout_ns;

-		if ((cmd.flags & MMC_RSP_R1B) == MMC_RSP_R1B) {
-			/*
-			 * Pretend this is a data transfer and rely on the
-			 * host driver to compute timeout.  When all host
-			 * drivers support cmd.cmd_timeout for R1B, this
-			 * can be changed to:
-			 *
-			 *     mrq.data = NULL;
-			 *     cmd.cmd_timeout = idata->ic.cmd_timeout_ms;
-			 */
-			data.timeout_ns = idata->ic.cmd_timeout_ms * 1000000;
-		}
-
 		mrq.data = &data;
 	}

-- 
2.37.3

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