linux-kernel - [PATCH 1/1] dw_mmc: insmod followed by rmmod will hung for eMMC

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Date:	Mon, 18 May 2015 14:23:16 +0000
From:	Prabu Thangamuthu <Prabu.T@...opsys.com>
To:	Seungwon Jeon <tgih.jun@...sung.com>,
	Jaehoon Chung <jh80.chung@...sung.com>,
	Ulf Hansson <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:	Manjunath M Bettegowda <Manjunath.MB@...opsys.com>,
	"prabu.t@...opsys.com" <prabu.t@...opsys.com>
Subject: [PATCH 1/1] dw_mmc: insmod followed by rmmod will hung for eMMC

Removing dw_mmc driver immediately after inserting the dw_mmc driver is 
getting hung for eMMC device. Root cause for this issue is, dw_mci_remove
will disable all the interrupts then it will call dw_mci_cleanup_slot.
dw_mci_cleanup_slot is issuing CMD6 to disable boot partition access and
it's waiting for command complete interrupt. Since INTMASK was already
cleared by dw_mci_remove, command complete interrupt is not reaching 
the system. This leads to process hung.

Signed-off-by: Prabu Thangamuthu <prabu.t@...opsys.com>
---
 drivers/mmc/host/dw_mmc.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
index 5f5adaf..f0a0aff 100644
--- a/drivers/mmc/host/dw_mmc.c
+++ b/drivers/mmc/host/dw_mmc.c
@@ -2941,15 +2941,15 @@ void dw_mci_remove(struct dw_mci *host)
 {
 	int i;
 
-	mci_writel(host, RINTSTS, 0xFFFFFFFF);
-	mci_writel(host, INTMASK, 0); /* disable all mmc interrupt first */
-
 	for (i = 0; i < host->num_slots; i++) {
 		dev_dbg(host->dev, "remove slot %d\n", i);
 		if (host->slot[i])
 			dw_mci_cleanup_slot(host->slot[i], i);
 	}
 
+	mci_writel(host, RINTSTS, 0xFFFFFFFF);
+	mci_writel(host, INTMASK, 0); /* disable all mmc interrupt first */
+
 	/* disable clock to CIU */
 	mci_writel(host, CLKENA, 0);
 	mci_writel(host, CLKSRC, 0);
-- 
1.7.6.5
--
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