diff options
| author | Ray Zhang <sgzhang@google.com> | 2022-10-10 04:55:49 +0000 |
|---|---|---|
| committer | Miquel Raynal <miquel.raynal@bootlin.com> | 2022-11-07 17:08:00 +0100 |
| commit | 7cc84e0e07d063c246809ea78f51607f858766bf (patch) | |
| tree | 1c894236c30d0c5abc457cafdd5a2a94fd197062 /drivers/mtd | |
| parent | 340193e079a899f5527cddccff2b5de2c98bc31b (diff) | |
| download | linux-7cc84e0e07d063c246809ea78f51607f858766bf.tar.bz2 | |
mtd: mtdoops: panic caused mtdoops to call mtdoops_erase function immediately
The panic function disables the local interrupts, preemption, and all
other processors. When the invoked mtdoops needs to erase a used page,
calling schedule_work() to do it will not work. Instead, just call
mtdoops_erase function immediately.
Tested:
~# echo c > /proc/sysrq-trigger
[ 171.654759] sysrq: Trigger a crash
[ 171.658325] Kernel panic - not syncing: sysrq triggered crash
......
[ 172.406423] mtdoops: not ready 34, 35 (erase immediately)
[ 172.432285] mtdoops: ready 34, 35
[ 172.435633] Rebooting in 10 seconds..
Signed-off-by: Ray Zhang <sgzhang@google.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20221010045549.2221965-4-sgzhang@google.com
Diffstat (limited to 'drivers/mtd')
| -rw-r--r-- | drivers/mtd/mtdoops.c | 24 |
1 files changed, 16 insertions, 8 deletions
diff --git a/drivers/mtd/mtdoops.c b/drivers/mtd/mtdoops.c index 0226b9e9ea8f..2f11585b5613 100644 --- a/drivers/mtd/mtdoops.c +++ b/drivers/mtd/mtdoops.c @@ -170,7 +170,7 @@ static void mtdoops_workfunc_erase(struct work_struct *work) mtdoops_erase(cxt); } -static void mtdoops_inc_counter(struct mtdoops_context *cxt) +static void mtdoops_inc_counter(struct mtdoops_context *cxt, int panic) { cxt->nextpage++; if (cxt->nextpage >= cxt->oops_pages) @@ -180,12 +180,20 @@ static void mtdoops_inc_counter(struct mtdoops_context *cxt) cxt->nextcount = 0; if (page_is_used(cxt, cxt->nextpage)) { - schedule_work(&cxt->work_erase); - return; + pr_debug("not ready %d, %d (erase %s)\n", + cxt->nextpage, cxt->nextcount, + panic ? "immediately" : "scheduled"); + if (panic) { + /* In case of panic, erase immediately */ + mtdoops_erase(cxt); + } else { + /* Otherwise, schedule work to erase it "nicely" */ + schedule_work(&cxt->work_erase); + } + } else { + pr_debug("ready %d, %d (no erase)\n", + cxt->nextpage, cxt->nextcount); } - - pr_debug("ready %d, %d (no erase)\n", - cxt->nextpage, cxt->nextcount); } static void mtdoops_write(struct mtdoops_context *cxt, int panic) @@ -221,7 +229,7 @@ static void mtdoops_write(struct mtdoops_context *cxt, int panic) mark_page_used(cxt, cxt->nextpage); memset(cxt->oops_buf, 0xff, record_size); - mtdoops_inc_counter(cxt); + mtdoops_inc_counter(cxt, panic); out: clear_bit(0, &cxt->oops_buf_busy); } @@ -286,7 +294,7 @@ static void find_next_position(struct mtdoops_context *cxt) cxt->nextcount = maxcount; } - mtdoops_inc_counter(cxt); + mtdoops_inc_counter(cxt, 0); } static void mtdoops_do_dump(struct kmsg_dumper *dumper, |