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authorRichard Purdie <rpurdie@rpsys.net>2008-01-29 11:27:11 +0000
committerDavid Woodhouse <dwmw2@infradead.org>2008-02-03 18:14:41 +1100
commit6ce0a856c10c8ab8568764436864616efa88e908 (patch)
tree39c6b56a261c7585357386f42b32d773490bcf84 /drivers/mtd
parent2986bd2a330e57af53c016276d63d46ded10e9c5 (diff)
[MTD] mtdoops: Perform write operations in a workqueue
Writing to the flash needs to be done in a workqueue. The console write functions may be called in any context which can lead to lockups otherwise. Signed-off-by: Richard Purdie <rpurdie@rpsys.net> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
Diffstat (limited to 'drivers/mtd')
-rw-r--r--drivers/mtd/mtdoops.c82
1 files changed, 42 insertions, 40 deletions
diff --git a/drivers/mtd/mtdoops.c b/drivers/mtd/mtdoops.c
index 723ca76d6b5..72c434c61b0 100644
--- a/drivers/mtd/mtdoops.c
+++ b/drivers/mtd/mtdoops.c
@@ -32,9 +32,10 @@
#define OOPS_PAGE_SIZE 4096
-static struct mtdoops_context {
+struct mtdoops_context {
int mtd_index;
- struct work_struct work;
+ struct work_struct work_erase;
+ struct work_struct work_write;
struct mtd_info *mtd;
int oops_pages;
int nextpage;
@@ -87,7 +88,7 @@ static int mtdoops_erase_block(struct mtd_info *mtd, int offset)
return 0;
}
-static int mtdoops_inc_counter(struct mtdoops_context *cxt)
+static void mtdoops_inc_counter(struct mtdoops_context *cxt)
{
struct mtd_info *mtd = cxt->mtd;
size_t retlen;
@@ -107,21 +108,26 @@ static int mtdoops_inc_counter(struct mtdoops_context *cxt)
printk(KERN_ERR "mtdoops: Read failure at %d (%td of 4 read)"
", err %d.\n", cxt->nextpage * OOPS_PAGE_SIZE,
retlen, ret);
- return 1;
+ schedule_work(&cxt->work_erase);
+ return;
}
/* See if we need to erase the next block */
- if (count != 0xffffffff)
- return 1;
+ if (count != 0xffffffff) {
+ schedule_work(&cxt->work_erase);
+ return;
+ }
printk(KERN_DEBUG "mtdoops: Ready %d, %d (no erase)\n",
cxt->nextpage, cxt->nextcount);
cxt->ready = 1;
- return 0;
}
-static void mtdoops_prepare(struct mtdoops_context *cxt)
+/* Scheduled work - when we can't proceed without erasing a block */
+static void mtdoops_workfunc_erase(struct work_struct *work)
{
+ struct mtdoops_context *cxt =
+ container_of(work, struct mtdoops_context, work_erase);
struct mtd_info *mtd = cxt->mtd;
int i = 0, j, ret, mod;
@@ -176,15 +182,31 @@ badblock:
goto badblock;
}
-static void mtdoops_workfunc(struct work_struct *work)
+static void mtdoops_workfunc_write(struct work_struct *work)
{
struct mtdoops_context *cxt =
- container_of(work, struct mtdoops_context, work);
+ container_of(work, struct mtdoops_context, work_write);
+ struct mtd_info *mtd = cxt->mtd;
+ size_t retlen;
+ int ret;
- mtdoops_prepare(cxt);
-}
+ if (cxt->writecount < OOPS_PAGE_SIZE)
+ memset(cxt->oops_buf + cxt->writecount, 0xff,
+ OOPS_PAGE_SIZE - cxt->writecount);
+
+ ret = mtd->write(mtd, cxt->nextpage * OOPS_PAGE_SIZE,
+ OOPS_PAGE_SIZE, &retlen, cxt->oops_buf);
+
+ cxt->writecount = 0;
+
+ if ((retlen != OOPS_PAGE_SIZE) || (ret < 0))
+ printk(KERN_ERR "mtdoops: Write failure at %d (%td of %d written), err %d.\n",
+ cxt->nextpage * OOPS_PAGE_SIZE, retlen, OOPS_PAGE_SIZE, ret);
+
+ mtdoops_inc_counter(cxt);
+}
-static int find_next_position(struct mtdoops_context *cxt)
+static void find_next_position(struct mtdoops_context *cxt)
{
struct mtd_info *mtd = cxt->mtd;
int ret, page, maxpos = 0;
@@ -222,20 +244,19 @@ static int find_next_position(struct mtdoops_context *cxt)
cxt->ready = 1;
printk(KERN_DEBUG "mtdoops: Ready %d, %d (first init)\n",
cxt->nextpage, cxt->nextcount);
- return 0;
+ return;
}
cxt->nextpage = maxpos;
cxt->nextcount = maxcount;
- return mtdoops_inc_counter(cxt);
+ mtdoops_inc_counter(cxt);
}
static void mtdoops_notify_add(struct mtd_info *mtd)
{
struct mtdoops_context *cxt = &oops_cxt;
- int ret;
if ((mtd->index != cxt->mtd_index) || cxt->mtd_index < 0)
return;
@@ -249,9 +270,7 @@ static void mtdoops_notify_add(struct mtd_info *mtd)
cxt->mtd = mtd;
cxt->oops_pages = mtd->size / OOPS_PAGE_SIZE;
- ret = find_next_position(cxt);
- if (ret == 1)
- mtdoops_prepare(cxt);
+ find_next_position(cxt);
printk(KERN_DEBUG "mtdoops: Attached to MTD device %d\n", mtd->index);
}
@@ -271,31 +290,13 @@ static void mtdoops_console_sync(void)
{
struct mtdoops_context *cxt = &oops_cxt;
struct mtd_info *mtd = cxt->mtd;
- size_t retlen;
- int ret;
- if (!cxt->ready || !mtd)
+ if (!cxt->ready || !mtd || cxt->writecount == 0)
return;
- if (cxt->writecount == 0)
- return;
-
- if (cxt->writecount < OOPS_PAGE_SIZE)
- memset(cxt->oops_buf + cxt->writecount, 0xff,
- OOPS_PAGE_SIZE - cxt->writecount);
-
- ret = mtd->write(mtd, cxt->nextpage * OOPS_PAGE_SIZE,
- OOPS_PAGE_SIZE, &retlen, cxt->oops_buf);
cxt->ready = 0;
- cxt->writecount = 0;
-
- if ((retlen != OOPS_PAGE_SIZE) || (ret < 0))
- printk(KERN_ERR "mtdoops: Write failure at %d (%td of %d written), err %d.\n",
- cxt->nextpage * OOPS_PAGE_SIZE, retlen, OOPS_PAGE_SIZE, ret);
- ret = mtdoops_inc_counter(cxt);
- if (ret == 1)
- schedule_work(&cxt->work);
+ schedule_work(&cxt->work_write);
}
static void
@@ -365,7 +366,8 @@ static int __init mtdoops_console_init(void)
return -ENOMEM;
}
- INIT_WORK(&cxt->work, mtdoops_workfunc);
+ INIT_WORK(&cxt->work_erase, mtdoops_workfunc_erase);
+ INIT_WORK(&cxt->work_write, mtdoops_workfunc_write);
register_console(&mtdoops_console);
register_mtd_user(&mtdoops_notifier);