Chuanxiao Dong cc8aa7de48 mmc: core: resolve divded by zero panic ... With one special SD card, below divide by zero error observed: ... [ 2.144300] divide error: 0000 [#1] PREEMPT SMP [ 2.148860] Modules linked in: [ 2.151898] [ 2.152685] Set up 4031 stolen pages starting at 0x0001f000, GTT offset 0K [ 2.157330] Set up 0 CI stolen pages starting at 0x00000000, GTT offset 131072K [ 2.167581] Pid: 5, comm: kworker/u:0 Not tainted 3.0.8-138216-g974a2ab #1 [ 2.169506] [drm] PSB GTT mem manager ready, tt_start 4031, tt_size 28737 pages [ 2.169906] [drm] SGX core id = 0x00000000 [ 2.169920] [drm] SGX core rev major = 0x00, minor = 0x00 [ 2.169934] [drm] SGX core rev maintenance = 0x00, designer = 0x00 [ 2.197370] Intel Corporation Medfield/iCDKB [ 2.201716] EIP: 0060:[<c1697ca6>] EFLAGS: 00010246 CPU: 1 [ 2.207198] EIP is at mmc_init_erase+0x76/0x150 [ 2.211704] EAX: 00002000 EBX: dcd1b400 ECX: 00002000 EDX: 00000000 [ 2.217957] ESI: 00000000 EDI: dcd5c800 EBP: dd867e84 ESP: dd867e7c [ 2.224214] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 [ 2.229605] Process kworker/u:0 (pid: 5, ti=dd866000 task=dd868000 task.ti=dd866000) [ 2.237325] Stack: [ 2.239322] dcd1b400 00000000 dd867eb0 c16a06da c1ab7c44 dd995aa8 00000003 00000000 [ 2.247054] 00000000 00000000 dcd5c800 00000000 dcd1b400 dd867ef8 c16a1012 c1698b00 [ 2.254785] 00000029 00000001 c194eb80 dcd5c9ec dd867e00 c1239b00 00000000 00000000 [ 2.262519] Call Trace: [ 2.264975] [<c16a06da>] mmc_sd_setup_card+0x1da/0x4f0 [ 2.270183] [<c16a1012>] mmc_sd_init_card+0x192/0xc40 [ 2.275304] [<c1698b00>] ? __mmc_claim_host+0x160/0x160 [ 2.280610] [<c1239b00>] ? __schedule_bug+0x50/0x80 [ 2.285556] [<c16a1b89>] mmc_attach_sd+0xc9/0x230 [ 2.290333] [<c169b6ef>] mmc_rescan+0x25f/0x2c0 [ 2.294943] [<c1274223>] process_one_work+0x103/0x400 [ 2.300065] [<c12670fd>] ? mod_timer+0x1ad/0x3c0 [ 2.304756] [<c169b490>] ? mmc_suspend_host+0x1a0/0x1a0 [ 2.310056] [<c127502d>] worker_thread+0x12d/0x4a0 [ 2.314921] [<c18fcfbd>] ? preempt_schedule+0x2d/0x50 [ 2.320047] [<c1274f00[ 2.323976] ---[ end trace 5398ec2720494438 ]--- ... So, seems this bad SD card does not set valid value in related SSR / CSD register fields. And then the driver will set card->erase_size to 0. Then it triggered this divided by zero error when calculate card->pref_erase. Submit this patch to fix the issue. Signed-off-by: Yunpeng Gao <yunpeng.gao@intel.com> Signed-off-by: Chuanxiao Dong <chuanxiao.dong@intel.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>		2014-09-09 13:59:17 +02:00
..
bus.c	mmc: core: Remove redundant runtime_idle callback	2014-07-09 11:25:58 +02:00
bus.h	mmc: rename dev_to_mmc_card() to mmc_dev_to_card()	2010-10-23 21:11:12 +08:00
core.c	mmc: core: resolve divded by zero panic	2014-09-09 13:59:17 +02:00
core.h	mmc: core: Let mmc_set_signal_voltage take ocr as parameter	2013-10-30 20:26:26 -04:00
debugfs.c	mmc: add support for HS400 mode of eMMC5.0	2014-05-12 18:06:06 -04:00
host.c	mmc: implement Driver Stage Register handling	2014-09-09 13:59:07 +02:00
host.h	mmc: start removing enable / disable API	2012-03-27 12:20:03 -04:00
Kconfig	mmc: core: Use MMC_UNSAFE_RESUME as default behavior	2014-02-13 22:58:15 -05:00
Makefile	mmc: extend and rename cd-gpio helpers to handle more slot GPIO functions	2012-07-10 23:04:04 -04:00
mmc.c	mmc: implement Driver Stage Register handling	2014-09-09 13:59:07 +02:00
mmc_ops.c	mmc: implement Driver Stage Register handling	2014-09-09 13:59:07 +02:00
mmc_ops.h	mmc: implement Driver Stage Register handling	2014-09-09 13:59:07 +02:00
quirks.c	mmc: quirks: Fixup debug message	2014-07-09 11:26:03 +02:00
sd.c	mmc: implement Driver Stage Register handling	2014-09-09 13:59:07 +02:00
sd.h	mmc: drop the speed mode of card's state	2014-05-12 18:05:53 -04:00
sd_ops.c	mmc: sd: warn if card stays busy during init	2014-07-09 11:26:07 +02:00
sd_ops.h	mmc: add erase, secure erase, trim and secure trim operations	2010-08-12 08:43:30 -07:00
sdio.c	mmc: core: sdio: Fix unconditional wake_up_process() on sdio thread	2014-09-09 13:59:04 +02:00
sdio_bus.c	mmc: core: Invoke sdio func driver's PM callbacks from the sdio bus	2014-04-22 07:06:40 -04:00
sdio_bus.h
sdio_cis.c	mmc: sdio: Change pr_warning to pr_warn_ratelimited	2012-07-22 15:25:48 -04:00
sdio_cis.h	sdio: split up common and function CIS parsing	2007-09-23 20:44:22 +02:00
sdio_io.c	mmc: sdio: Use multiple scatter/gather list	2012-12-06 13:54:43 -05:00
sdio_irq.c	mmc: core: sdio: Fix unconditional wake_up_process() on sdio thread	2014-09-09 13:59:04 +02:00
sdio_ops.c	mmc: sdio: Use multiple scatter/gather list	2012-12-06 13:54:43 -05:00
sdio_ops.h	sdio: recognize io card without powercycle	2010-03-12 15:52:28 -08:00
slot-gpio.c	mmc: Delay the card_event callback into the mmc_rescan worker	2014-04-22 07:06:36 -04:00