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

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 <[email protected]> know about it.

From: Shawn Lin <[email protected]>
Date: Fri, 23 Feb 2018 16:47:25 +0800
Subject: mmc: dw_mmc: Avoid accessing registers in runtime suspended state

From: Shawn Lin <[email protected]>

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.

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

@@ -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 [email protected] 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