forked from luck/tmp_suning_uos_patched
mtd: fix race in cfi_cmdset_0001 driver
As inval_cache_and_wait_for_operation() drop and reclaim the lock to invalidate the cache, some other thread may suspend the operation before reaching the for(;;) loop. Therefore the loop must start with checking the chip->state before reading status from the chip. Signed-off-by: Joakim Tjernlund <Joakim.Tjernlund@transmode.se> Acked-by: Michael Cashwell <mboards@prograde.net> Acked-by: Stefan Bigler <stefan.bigler@keymile.com> Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com> Cc: stable@kernel.org
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@ -1230,10 +1230,32 @@ static int inval_cache_and_wait_for_operation(
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sleep_time = chip_op_time / 2;
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for (;;) {
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if (chip->state != chip_state) {
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/* Someone's suspended the operation: sleep */
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DECLARE_WAITQUEUE(wait, current);
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set_current_state(TASK_UNINTERRUPTIBLE);
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add_wait_queue(&chip->wq, &wait);
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mutex_unlock(&chip->mutex);
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schedule();
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remove_wait_queue(&chip->wq, &wait);
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mutex_lock(&chip->mutex);
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continue;
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}
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status = map_read(map, cmd_adr);
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if (map_word_andequal(map, status, status_OK, status_OK))
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break;
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if (chip->erase_suspended && chip_state == FL_ERASING) {
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/* Erase suspend occured while sleep: reset timeout */
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timeo = reset_timeo;
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chip->erase_suspended = 0;
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}
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if (chip->write_suspended && chip_state == FL_WRITING) {
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/* Write suspend occured while sleep: reset timeout */
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timeo = reset_timeo;
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chip->write_suspended = 0;
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}
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if (!timeo) {
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map_write(map, CMD(0x70), cmd_adr);
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chip->state = FL_STATUS;
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@ -1257,27 +1279,6 @@ static int inval_cache_and_wait_for_operation(
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timeo--;
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}
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mutex_lock(&chip->mutex);
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while (chip->state != chip_state) {
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/* Someone's suspended the operation: sleep */
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DECLARE_WAITQUEUE(wait, current);
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set_current_state(TASK_UNINTERRUPTIBLE);
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add_wait_queue(&chip->wq, &wait);
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mutex_unlock(&chip->mutex);
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schedule();
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remove_wait_queue(&chip->wq, &wait);
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mutex_lock(&chip->mutex);
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}
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if (chip->erase_suspended && chip_state == FL_ERASING) {
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/* Erase suspend occured while sleep: reset timeout */
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timeo = reset_timeo;
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chip->erase_suspended = 0;
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}
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if (chip->write_suspended && chip_state == FL_WRITING) {
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/* Write suspend occured while sleep: reset timeout */
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timeo = reset_timeo;
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chip->write_suspended = 0;
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}
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}
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/* Done and happy. */
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