diff options
Diffstat (limited to 'drivers/mtd/mtdoops.c')
| -rw-r--r-- | drivers/mtd/mtdoops.c | 17 |
1 files changed, 15 insertions, 2 deletions
diff --git a/drivers/mtd/mtdoops.c b/drivers/mtd/mtdoops.c index 774970bfcf85..862c4a889234 100644 --- a/drivers/mtd/mtdoops.c +++ b/drivers/mtd/mtdoops.c @@ -52,6 +52,7 @@ static struct mtdoops_context { int nextcount; unsigned long *oops_page_used; + unsigned long oops_buf_busy; void *oops_buf; } oops_cxt; @@ -180,6 +181,9 @@ static void mtdoops_write(struct mtdoops_context *cxt, int panic) u32 *hdr; int ret; + if (test_and_set_bit(0, &cxt->oops_buf_busy)) + return; + /* Add mtdoops header to the buffer */ hdr = cxt->oops_buf; hdr[0] = cxt->nextcount; @@ -190,7 +194,7 @@ static void mtdoops_write(struct mtdoops_context *cxt, int panic) record_size, &retlen, cxt->oops_buf); if (ret == -EOPNOTSUPP) { printk(KERN_ERR "mtdoops: Cannot write from panic without panic_write\n"); - return; + goto out; } } else ret = mtd_write(mtd, cxt->nextpage * record_size, @@ -203,6 +207,8 @@ static void mtdoops_write(struct mtdoops_context *cxt, int panic) memset(cxt->oops_buf, 0xff, record_size); mtdoops_inc_counter(cxt); +out: + clear_bit(0, &cxt->oops_buf_busy); } static void mtdoops_workfunc_write(struct work_struct *work) @@ -271,13 +277,19 @@ static void mtdoops_do_dump(struct kmsg_dumper *dumper, { struct mtdoops_context *cxt = container_of(dumper, struct mtdoops_context, dump); + struct kmsg_dump_iter iter; /* Only dump oopses if dump_oops is set */ if (reason == KMSG_DUMP_OOPS && !dump_oops) return; - kmsg_dump_get_buffer(dumper, true, cxt->oops_buf + MTDOOPS_HEADER_SIZE, + kmsg_dump_rewind(&iter); + + if (test_and_set_bit(0, &cxt->oops_buf_busy)) + return; + kmsg_dump_get_buffer(&iter, true, cxt->oops_buf + MTDOOPS_HEADER_SIZE, record_size - MTDOOPS_HEADER_SIZE, NULL); + clear_bit(0, &cxt->oops_buf_busy); if (reason != KMSG_DUMP_OOPS) { /* Panics must be written immediately */ @@ -394,6 +406,7 @@ static int __init mtdoops_init(void) return -ENOMEM; } memset(cxt->oops_buf, 0xff, record_size); + cxt->oops_buf_busy = 0; INIT_WORK(&cxt->work_erase, mtdoops_workfunc_erase); INIT_WORK(&cxt->work_write, mtdoops_workfunc_write); |