]> err.no Git - linux-2.6/commitdiff
[MTD] [NOR] fix ctrl-alt-del can't reboot for intel flash bug
authorKevin Hao <haokexin@gmail.com>
Tue, 2 Oct 2007 20:56:04 +0000 (13:56 -0700)
committerDavid Woodhouse <dwmw2@infradead.org>
Sat, 13 Oct 2007 13:36:18 +0000 (14:36 +0100)
When we press ctrl-alt-del,kernel_restart_prepare will invoke
cfi_intelext_reboot which will set flash to read array mode, but later
when device_shutdown is invoked which may put current work queue to
sleep and other process may be scheduled to running and programming
flash in not FL_READY mode again. So we can't boot up if this flash is
used for bootloader.

Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
drivers/mtd/chips/cfi_cmdset_0001.c
include/linux/mtd/flashchip.h

index c655e971c15864019a09258ba719048df42a8a88..3aa3dca56ae6ea8dd16cef96d222905a14516a76 100644 (file)
@@ -653,7 +653,7 @@ static int get_chip(struct map_info *map, struct flchip *chip, unsigned long adr
  resettime:
        timeo = jiffies + HZ;
  retry:
-       if (chip->priv && (mode == FL_WRITING || mode == FL_ERASING || mode == FL_OTP_WRITE)) {
+       if (chip->priv && (mode == FL_WRITING || mode == FL_ERASING || mode == FL_OTP_WRITE || mode == FL_SHUTDOWN)) {
                /*
                 * OK. We have possibility for contension on the write/erase
                 * operations which are global to the real chip and not per
@@ -798,6 +798,9 @@ static int get_chip(struct map_info *map, struct flchip *chip, unsigned long adr
                if (mode == FL_READY && chip->oldstate == FL_READY)
                        return 0;
 
+       case FL_SHUTDOWN:
+               /* The machine is rebooting now,so no one can get chip anymore */
+               return -EIO;
        default:
        sleep:
                set_current_state(TASK_UNINTERRUPTIBLE);
@@ -2409,10 +2412,10 @@ static int cfi_intelext_reset(struct mtd_info *mtd)
                   and switch to array mode so any bootloader in
                   flash is accessible for soft reboot. */
                spin_lock(chip->mutex);
-               ret = get_chip(map, chip, chip->start, FL_SYNCING);
+               ret = get_chip(map, chip, chip->start, FL_SHUTDOWN);
                if (!ret) {
                        map_write(map, CMD(0xff), chip->start);
-                       chip->state = FL_READY;
+                       chip->state = FL_SHUTDOWN;
                }
                spin_unlock(chip->mutex);
        }
index a293a3b78e05741ff372229959aee31fb5b5e834..39e7d2a1be9a5a93657e3af6d62c8f9dd901ac88 100644 (file)
@@ -40,6 +40,7 @@ typedef enum {
        FL_POINT,
        FL_XIP_WHILE_ERASING,
        FL_XIP_WHILE_WRITING,
+       FL_SHUTDOWN,
        FL_UNKNOWN
 } flstate_t;