Patch "mmc: dw_mmc: Avoid accessing registers in runtime suspended state" has been added to the 4.15-stable tree

Patch "mmc: dw_mmc: Avoid accessing registers in runtime suspended state" has been added to the 4.15-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    mmc: dw_mmc: Avoid accessing registers in runtime suspended state

to the 4.15-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     mmc-dw_mmc-avoid-accessing-registers-in-runtime-suspended-state.patch
and it can be found in the queue-4.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 5b43df8b4c1a7f0c3fbf793c9566068e6b1e570c Mon Sep 17 00:00:00 2001
From: Shawn Lin <shawn.lin@rock-chips.com>
Date: Fri, 23 Feb 2018 16:47:25 +0800
Subject: mmc: dw_mmc: Avoid accessing registers in runtime suspended state

From: Shawn Lin <shawn.lin@rock-chips.com>

commit 5b43df8b4c1a7f0c3fbf793c9566068e6b1e570c upstream.

cat /sys/kernel/debug/mmc0/regs will hang up the system since
it's in runtime suspended state, so the genpd and biu_clk is
off. This patch fixes this problem by calling pm_runtime_get_sync
to wake it up before reading the registers.

Fixes: e9ed8835e990 ("mmc: dw_mmc: add runtime PM callback")
Cc: <stable@vger.kernel.org>
Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/mmc/host/dw_mmc.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/drivers/mmc/host/dw_mmc.c
+++ b/drivers/mmc/host/dw_mmc.c
@@ -165,6 +165,8 @@ static int dw_mci_regs_show(struct seq_f
 {
 	struct dw_mci *host = s->private;
 
+	pm_runtime_get_sync(host->dev);
+
 	seq_printf(s, "STATUS:\t0x%08x\n", mci_readl(host, STATUS));
 	seq_printf(s, "RINTSTS:\t0x%08x\n", mci_readl(host, RINTSTS));
 	seq_printf(s, "CMD:\t0x%08x\n", mci_readl(host, CMD));
@@ -172,6 +174,8 @@ static int dw_mci_regs_show(struct seq_f
 	seq_printf(s, "INTMASK:\t0x%08x\n", mci_readl(host, INTMASK));
 	seq_printf(s, "CLKENA:\t0x%08x\n", mci_readl(host, CLKENA));
 
+	pm_runtime_put_autosuspend(host->dev);
+
 	return 0;
 }
 


Patches currently in stable-queue which might be from shawn.lin@rock-chips.com are

queue-4.15/mmc-dw_mmc-factor-out-dw_mci_init_slot_caps.patch
queue-4.15/mmc-dw_mmc-fix-out-of-bounds-access-for-slot-s-caps.patch
queue-4.15/mmc-dw_mmc-avoid-accessing-registers-in-runtime-suspended-state.patch
queue-4.15/mmc-dw_mmc-k3-fix-out-of-bounds-access-through-dt-alias.patch