The patch titled
mg_disk: fix reading invalid status when use polling driver
has been removed from the -mm tree. Its filename was
mg_disk-fix-reading-invalid-status-when-use-polling-driver.patch
This patch was dropped because it was merged into mainline or a subsystem tree
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: mg_disk: fix reading invalid status when use polling driver
From: unsik Kim <donari75@xxxxxxxxx>
When using polling driver, little delay is required to access status
register. Without this, host might read invalid status.
Signed-off-by: unsik Kim <donari75@xxxxxxxxx>
Cc: Jens Axboe <jens.axboe@xxxxxxxxxx>
Cc: Tejun Heo <tj@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/block/mg_disk.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff -puN drivers/block/mg_disk.c~mg_disk-fix-reading-invalid-status-when-use-polling-driver drivers/block/mg_disk.c
--- a/drivers/block/mg_disk.c~mg_disk-fix-reading-invalid-status-when-use-polling-driver
+++ a/drivers/block/mg_disk.c
@@ -219,6 +219,16 @@ static unsigned int mg_wait(struct mg_ho
host->error = MG_ERR_NONE;
expire = jiffies + msecs_to_jiffies(msec);
+ /* These 2 times dummy status read prevents reading invalid
+ * status. A very little time (3 times of mflash operating clk)
+ * is required for busy bit is set. Use dummy read instead of
+ * busy wait, because mflash's PLL is machine dependent.
+ */
+ if (prv_data->use_polling) {
+ status = inb((unsigned long)host->dev_base + MG_REG_STATUS);
+ status = inb((unsigned long)host->dev_base + MG_REG_STATUS);
+ }
+
status = inb((unsigned long)host->dev_base + MG_REG_STATUS);
do {
_
Patches currently in -mm which might be from donari75@xxxxxxxxx are
linux-next.patch
--
To unsubscribe from this list: send the line "unsubscribe mm-commits" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
