Commit 913759ac authored by Alan Cox's avatar Alan Cox Committed by Linus Torvalds

[PATCH] ide: Fix crash on repeated reset

Michal Miroslaw reported a problem (bugzilla #7023) where a user initiated
reset while the IDE layer was already resetting the channel caused a crash,
and provided a rough fix.

This is a slightly cleaner version of the fix which tracks the reset state
and blocks further reset requests while a reset is in progress.

Note this is not a security issue - random end users can't access the
ioctl in question anyway.
Signed-off-by: default avatarAlan Cox <alan@redhat.com>
Cc: Michal Miroslaw <mirq-linux@rere.qmqm.pl>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent b86cc29d
......@@ -998,6 +998,7 @@ static ide_startstop_t atapi_reset_pollfunc (ide_drive_t *drive)
}
/* done polling */
hwgroup->polling = 0;
hwgroup->resetting = 0;
return ide_stopped;
}
......@@ -1057,6 +1058,7 @@ static ide_startstop_t reset_pollfunc (ide_drive_t *drive)
}
}
hwgroup->polling = 0; /* done polling */
hwgroup->resetting = 0; /* done reset attempt */
return ide_stopped;
}
......@@ -1143,6 +1145,7 @@ static ide_startstop_t do_reset1 (ide_drive_t *drive, int do_not_try_atapi)
/* For an ATAPI device, first try an ATAPI SRST. */
if (drive->media != ide_disk && !do_not_try_atapi) {
hwgroup->resetting = 1;
pre_reset(drive);
SELECT_DRIVE(drive);
udelay (20);
......@@ -1168,6 +1171,7 @@ static ide_startstop_t do_reset1 (ide_drive_t *drive, int do_not_try_atapi)
return ide_stopped;
}
hwgroup->resetting = 1;
/*
* Note that we also set nIEN while resetting the device,
* to mask unwanted interrupts from the interface during the reset.
......
......@@ -1364,6 +1364,11 @@ int generic_ide_ioctl(ide_drive_t *drive, struct file *file, struct block_device
spin_lock_irqsave(&ide_lock, flags);
if (HWGROUP(drive)->resetting) {
spin_unlock_irqrestore(&ide_lock, flags);
return -EBUSY;
}
ide_abort(drive, "drive reset");
BUG_ON(HWGROUP(drive)->handler);
......
......@@ -825,6 +825,9 @@ typedef struct hwgroup_s {
unsigned int sleeping : 1;
/* BOOL: polling active & poll_timeout field valid */
unsigned int polling : 1;
/* BOOL: in a polling reset situation. Must not trigger another reset yet */
unsigned int resetting : 1;
/* current drive */
ide_drive_t *drive;
/* ptr to current hwif in linked-list */
......
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