linux-kernel - [PATCH 4.14 07/72] mmc: sdhci: fix the timeout check window for clock and reset

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Date:   Thu, 20 Dec 2018 10:18:06 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Alek Du <alek.du@...el.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Ulf Hansson <ulf.hansson@...aro.org>
Subject: [PATCH 4.14 07/72] mmc: sdhci: fix the timeout check window for clock and reset

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Alek Du <alek.du@...el.com>

commit b704441e38f645dcfba1348ca3cc1ba43d1a9f31 upstream.

We observed some premature timeouts on a virtualization platform, the log
is like this:

case 1:
[159525.255629] mmc1: Internal clock never stabilised.
[159525.255818] mmc1: sdhci: ============ SDHCI REGISTER DUMP ===========
[159525.256049] mmc1: sdhci: Sys addr:  0x00000000 | Version:  0x00001002
...
[159525.257205] mmc1: sdhci: Wake-up:   0x00000000 | Clock:    0x0000fa03
>>From the clock control register dump, we are pretty sure the clock was
stablized.

case 2:
[  914.550127] mmc1: Reset 0x2 never completed.
[  914.550321] mmc1: sdhci: ============ SDHCI REGISTER DUMP ===========
[  914.550608] mmc1: sdhci: Sys addr:  0x00000010 | Version:  0x00001002

After checking the sdhci code, we found the timeout check actually has a
little window that the CPU can be scheduled out and when it comes back,
the original time set or check is not valid.

Fixes: 5a436cc0af62 ("mmc: sdhci: Optimize delay loops")
Cc: stable@...r.kernel.org      # v4.12+
Signed-off-by: Alek Du <alek.du@...el.com>
Acked-by: Adrian Hunter <adrian.hunter@...el.com>
Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/mmc/host/sdhci.c |   18 +++++++++++++-----
 1 file changed, 13 insertions(+), 5 deletions(-)

--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -193,8 +193,12 @@ void sdhci_reset(struct sdhci_host *host
 	timeout = ktime_add_ms(ktime_get(), 100);
 
 	/* hw clears the bit when it's done */
-	while (sdhci_readb(host, SDHCI_SOFTWARE_RESET) & mask) {
-		if (ktime_after(ktime_get(), timeout)) {
+	while (1) {
+		bool timedout = ktime_after(ktime_get(), timeout);
+
+		if (!(sdhci_readb(host, SDHCI_SOFTWARE_RESET) & mask))
+			break;
+		if (timedout) {
 			pr_err("%s: Reset 0x%x never completed.\n",
 				mmc_hostname(host->mmc), (int)mask);
 			sdhci_dumpregs(host);
@@ -1417,9 +1421,13 @@ void sdhci_enable_clk(struct sdhci_host
 
 	/* Wait max 20 ms */
 	timeout = ktime_add_ms(ktime_get(), 20);
-	while (!((clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL))
-		& SDHCI_CLOCK_INT_STABLE)) {
-		if (ktime_after(ktime_get(), timeout)) {
+	while (1) {
+		bool timedout = ktime_after(ktime_get(), timeout);
+
+		clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
+		if (clk & SDHCI_CLOCK_INT_STABLE)
+			break;
+		if (timedout) {
 			pr_err("%s: Internal clock never stabilised.\n",
 			       mmc_hostname(host->mmc));
 			sdhci_dumpregs(host);