scsi: core: Avoid that ATA error handling can trigger a kernel hang or oops

scsi: core: Avoid that ATA error handling can trigger a kernel hang or oops

Avoid that the recently introduced call_rcu() call in the SCSI core
triggers a double call_rcu() call.

Reported-by: Natanael Copa <[email protected]>
Reported-by: Damien Le Moal <[email protected]>
References: https://bugzilla.kernel.org/show_bug.cgi?id=198861
Fixes: 3bd6f43f5cb3 ("scsi: core: Ensure that the SCSI error handler gets woken up")
Signed-off-by: Bart Van Assche <[email protected]>
Reviewed-by: Damien Le Moal <[email protected]>
Tested-by: Damien Le Moal <[email protected]>
Cc: Natanael Copa <[email protected]>
Cc: Damien Le Moal <[email protected]>
Cc: Alexandre Oliva <[email protected]>
Cc: Pavel Tikhomirov <[email protected]>
Cc: Hannes Reinecke <[email protected]>
Cc: Johannes Thumshirn <[email protected]>
Cc: <[email protected]>
Signed-off-by: Martin K. Petersen <[email protected]>