ide-tape: remove back-to-back REQUEST_SENSE detection

Impact: fix an oops which always triggers

ide_tape_issue_pc() assumed drive->pc isn't NULL on invocation when
checking for back-to-back request sense issues but drive->pc can be
NULL and even when it's not NULL, it's not safe to dereference it once
the previous command is complete because pc could have been freed or
was on stack.  Kill back-to-back REQUEST_SENSE detection.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

diff --git a/drivers/ide/ide-tape.c b/drivers/ide/ide-tape.c
index cb942a9b580f6ee66bd9f6d50998a664719625c8..3a53e0834cf798d6bbc7c5fca982d192d1941fd3 100644 (file)
--- a/drivers/ide/ide-tape.c
+++ b/drivers/ide/ide-tape.c
@@ -614,12 +614,6 @@ static ide_startstop_t ide_tape_issue_pc(ide_drive_t *drive,
 {
        idetape_tape_t *tape = drive->driver_data;
 
-       if (drive->pc->c[0] == REQUEST_SENSE &&
-           pc->c[0] == REQUEST_SENSE) {
-               printk(KERN_ERR "ide-tape: possible ide-tape.c bug - "
-                       "Two request sense in serial were issued\n");
-       }
-
        if (drive->failed_pc == NULL && pc->c[0] != REQUEST_SENSE)
                drive->failed_pc = pc;