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SCSI: Fix error handling when no ULD is attached

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Commit 18a4d0a22e ("[SCSI] Handle disk devices which can not process
medium access commands") introduced a bug in which we would attempt to
dereference the scsi driver even when the device had no ULD attached.

Ensure that a driver is registered and make the driver accessor function
more resilient to errors during device discovery.

Reported-by: Elric Fu <[email protected]>
Reported-by: Bart Van Assche <[email protected]>
Signed-off-by: Martin K. Petersen <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Martin K. Petersen 2012-04-14 23:01:28 -04:00 • committed by Linus Torvalds
commit 919f797a4c
2 changed files with 4 additions and 1 deletions
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2
drivers/scsi/scsi_error.c
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@ -835,7 +835,7 @@ static int scsi_send_eh_cmnd(struct scsi_cmnd *scmd, unsigned char *cmnd,
scsi_eh_restore_cmnd(scmd, &ses);
if (sdrv->eh_action)
if (sdrv && sdrv->eh_action)
rtn = sdrv->eh_action(scmd, cmnd, cmnd_size, rtn);
return rtn;