[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Message-ID: <705D14B1C7978B40A723277C067CEDE245182CD0@IN01WEMBXB.internal.synopsys.com>
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
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists