From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
stable@vger.kernel.org, Alek Du <alek.du@intel.com>,
Adrian Hunter <adrian.hunter@intel.com>,
Ulf Hansson <ulf.hansson@linaro.org>
Subject: [PATCH 4.19 20/44] mmc: sdhci: fix the timeout check window for clock and reset
Date: Tue, 18 Dec 2018 17:39:32 +0100 [thread overview]
Message-ID: <20181218163929.871016709@linuxfoundation.org> (raw)
In-Reply-To: <20181218163927.119623235@linuxfoundation.org>
4.19-stable review patch. If anyone has any objections, please let me know.
------------------
From: Alek Du <alek.du@intel.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@vger.kernel.org # v4.12+
Signed-off-by: Alek Du <alek.du@intel.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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);
@@ -1495,9 +1499,13 @@ 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);
next prev parent reply other threads:[~2018-12-18 16:44 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-18 16:39 [PATCH 4.19 00/44] 4.19.11-stable review Greg Kroah-Hartman
2018-12-18 16:39 ` [PATCH 4.19 01/44] sched/pelt: Fix warning and clean up IRQ PELT config Greg Kroah-Hartman
2018-12-18 16:39 ` [PATCH 4.19 02/44] scsi: raid_attrs: fix unused variable warning Greg Kroah-Hartman
2018-12-18 16:39 ` [PATCH 4.19 03/44] staging: olpc_dcon: add a missing dependency Greg Kroah-Hartman
2018-12-18 16:39 ` [PATCH 4.19 04/44] slimbus: ngd: mark PM functions as __maybe_unused Greg Kroah-Hartman
2018-12-18 16:39 ` [PATCH 4.19 05/44] i2c: aspeed: fix build warning Greg Kroah-Hartman
2018-12-18 16:39 ` [PATCH 4.19 06/44] ARM: dts: qcom-apq8064-arrow-sd-600eval fix graph_endpoint warning Greg Kroah-Hartman
2018-12-18 16:39 ` [PATCH 4.19 07/44] drm/msm: fix address space warning Greg Kroah-Hartman
2018-12-18 16:39 ` [PATCH 4.19 08/44] pinctrl: sunxi: a83t: Fix IRQ offset typo for PH11 Greg Kroah-Hartman
2018-12-18 16:39 ` [PATCH 4.19 09/44] aio: fix spectre gadget in lookup_ioctx Greg Kroah-Hartman
2018-12-18 16:39 ` [PATCH 4.19 10/44] scripts/spdxcheck.py: always open files in binary mode Greg Kroah-Hartman
2018-12-18 16:39 ` [PATCH 4.19 11/44] fs/iomap.c: get/put the page in iomap_page_create/release() Greg Kroah-Hartman
2018-12-18 16:39 ` [PATCH 4.19 12/44] userfaultfd: check VM_MAYWRITE was set after verifying the uffd is registered Greg Kroah-Hartman
2018-12-18 16:39 ` [PATCH 4.19 13/44] arm64: dma-mapping: Fix FORCE_CONTIGUOUS buffer clearing Greg Kroah-Hartman
2018-12-18 16:39 ` [PATCH 4.19 14/44] block/bio: Do not zero user pages Greg Kroah-Hartman
2018-12-18 16:39 ` [PATCH 4.19 15/44] ovl: fix decode of dir file handle with multi lower layers Greg Kroah-Hartman
2018-12-18 16:39 ` [PATCH 4.19 16/44] ovl: fix missing override creds in link of a metacopy upper Greg Kroah-Hartman
2018-12-18 16:39 ` [PATCH 4.19 17/44] MMC: OMAP: fix broken MMC on OMAP15XX/OMAP5910/OMAP310 Greg Kroah-Hartman
2018-12-18 16:39 ` [PATCH 4.19 18/44] mmc: core: use mrq->sbc when sending CMD23 for RPMB Greg Kroah-Hartman
2018-12-18 16:39 ` [PATCH 4.19 19/44] mmc: sdhci-omap: Fix DCRC error handling during tuning Greg Kroah-Hartman
2018-12-18 16:39 ` Greg Kroah-Hartman [this message]
2018-12-18 16:39 ` [PATCH 4.19 21/44] fuse: continue to send FUSE_RELEASEDIR when FUSE_OPEN returns ENOSYS Greg Kroah-Hartman
2018-12-18 16:39 ` [PATCH 4.19 22/44] ARM: mmp/mmp2: fix cpu_is_mmp2() on mmp2-dt Greg Kroah-Hartman
2018-12-18 16:39 ` [PATCH 4.19 23/44] ARM: dts: bcm2837: Fix polarity of wifi reset GPIOs Greg Kroah-Hartman
2018-12-18 16:39 ` [PATCH 4.19 24/44] dm thin: send event about thin-pool state change _after_ making it Greg Kroah-Hartman
2018-12-18 16:39 ` [PATCH 4.19 25/44] dm cache metadata: verify cache has blocks in blocks_are_clean_separate_dirty() Greg Kroah-Hartman
2018-12-18 16:39 ` [PATCH 4.19 26/44] dm: call blk_queue_split() to impose device limits on bios Greg Kroah-Hartman
2018-12-18 16:39 ` [PATCH 4.19 27/44] tracing: Fix memory leak in create_filter() Greg Kroah-Hartman
2018-12-18 16:39 ` [PATCH 4.19 28/44] tracing: Fix memory leak in set_trigger_filter() Greg Kroah-Hartman
2018-12-18 16:39 ` [PATCH 4.19 29/44] tracing: Fix memory leak of instance function hash filters Greg Kroah-Hartman
2018-12-18 16:39 ` [PATCH 4.19 30/44] media: vb2: dont call __vb2_queue_cancel if vb2_start_streaming failed Greg Kroah-Hartman
2018-12-18 16:39 ` [PATCH 4.19 31/44] powerpc/msi: Fix NULL pointer access in teardown code Greg Kroah-Hartman
2018-12-18 16:39 ` [PATCH 4.19 32/44] powerpc: Look for "stdout-path" when setting up legacy consoles Greg Kroah-Hartman
2018-12-18 16:39 ` [PATCH 4.19 33/44] drm/nouveau/kms: Fix memory leak in nv50_mstm_del() Greg Kroah-Hartman
2018-12-18 16:39 ` [PATCH 4.19 34/44] drm/nouveau/kms/nv50-: also flush fb writes when rewinding push buffer Greg Kroah-Hartman
2018-12-18 16:39 ` [PATCH 4.19 35/44] Revert "drm/rockchip: Allow driver to be shutdown on reboot/kexec" Greg Kroah-Hartman
2018-12-18 16:39 ` [PATCH 4.19 36/44] drm/i915/gvt: Fix tiled memory decoding bug on BDW Greg Kroah-Hartman
2018-12-18 16:39 ` [PATCH 4.19 37/44] drm/i915/execlists: Apply a full mb before execution for Braswell Greg Kroah-Hartman
2018-12-18 16:39 ` [PATCH 4.19 38/44] drm/amdgpu/powerplay: Apply avfs cks-off voltages on VI Greg Kroah-Hartman
2018-12-18 16:39 ` [PATCH 4.19 39/44] drm/amdkfd: add new vega10 pci ids Greg Kroah-Hartman
2018-12-18 16:39 ` [PATCH 4.19 40/44] drm/amdgpu: add some additional " Greg Kroah-Hartman
2018-12-18 16:39 ` [PATCH 4.19 41/44] drm/amdgpu: update smu firmware images for VI variants (v2) Greg Kroah-Hartman
2018-12-18 16:39 ` [PATCH 4.19 42/44] drm/amdgpu: update SMC firmware image for polaris10 variants Greg Kroah-Hartman
2018-12-18 16:39 ` [PATCH 4.19 43/44] dm zoned: Fix target BIO completion handling Greg Kroah-Hartman
2018-12-18 16:39 ` [PATCH 4.19 44/44] x86/build: Fix compiler support check for CONFIG_RETPOLINE Greg Kroah-Hartman
2018-12-18 20:26 ` [PATCH 4.19 00/44] 4.19.11-stable review shuah
2018-12-19 13:19 ` Greg Kroah-Hartman
2018-12-18 21:10 ` Dan Rue
2018-12-19 13:19 ` Greg Kroah-Hartman
2018-12-19 15:01 ` Harsh Shandilya
2018-12-19 15:14 ` Greg Kroah-Hartman
2018-12-19 17:23 ` Guenter Roeck
2018-12-19 18:37 ` Greg Kroah-Hartman
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