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[MTD] Add sync/unblank function to mtdoops 

mtdoops wasn't ensuring data was flushed to flash in crash situations
after recent changes in mainline kernels as tracking the
oops_in_progress variable was no longer enough. We can use the "unblank"
console call as a sync call to tell us to write out the buffer though.

Therefore add a sync function to mtdoops and call this when console
unblank events occur.

Signed-off-by: Richard Purdie <rpurdie@openedhand.com>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
This commit is contained in:
Richard Purdie 2007-07-10 20:33:54 +01:00 committed by David Woodhouse
parent a2e96b627b
commit 8691a729a2
1 changed files with 35 additions and 24 deletions
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59
drivers/mtd/mtdoops.c
View File

@ -250,40 +250,50 @@ static void mtdoops_notify_remove(struct mtd_info *mtd)
flush_scheduled_work();
}
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)
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 (%d 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);
}
static void
mtdoops_console_write(struct console *co, const char *s, unsigned int count)
{
struct mtdoops_context *cxt = co->data;
struct mtd_info *mtd = cxt->mtd;
int i, ret;
int i;
if (!cxt->ready || !mtd)
if (!oops_in_progress) {
mtdoops_console_sync();
return;
if (!oops_in_progress && cxt->writecount != 0) {
size_t retlen;
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 (%d 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);
}
if (!oops_in_progress)
if (!cxt->ready || !mtd)
return;
if (cxt->writecount == 0) {
@ -323,6 +333,7 @@ static struct console mtdoops_console = {
.name = "ttyMTD",
.write = mtdoops_console_write,
.setup = mtdoops_console_setup,
.unblank = mtdoops_console_sync,
.flags = CON_PRINTBUFFER,
.index = -1,
.data = &oops_cxt,