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| author | Finn Thain <fthain@telegraphics.com.au> | 2020-11-20 15:39:56 +1100 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2020-11-23 22:12:09 -0500 |
| commit | 03fe6a640a05c5dc04b6bcdddfb981d015e84ed4 (patch) | |
| tree | d3ed4bbb0cbcea87439e6bb56cfa1625c8acceb7 /drivers/scsi/NCR5380.c | |
| parent | 66df79ccbc2f617a2bbaa7108a2b50a6869de5d4 (diff) | |
| download | linux-03fe6a640a05c5dc04b6bcdddfb981d015e84ed4.tar.bz2 | |
scsi: atari_scsi: Fix race condition between .queuecommand and EH
It is possible that bus_reset_cleanup() or .eh_abort_handler could be
invoked during NCR5380_queuecommand(). If that takes place before the new
command is enqueued and after the ST-DMA "lock" has been acquired, the
ST-DMA "lock" will be released again. This will result in a lost DMA
interrupt and a command timeout. Fix this by excluding EH and interrupt
handlers while the new command is enqueued.
Link: https://lore.kernel.org/r/af25163257796b50bb99d4ede4025cea55787b8f.1605847196.git.fthain@telegraphics.com.au
Tested-by: Michael Schmitz <schmitzmic@gmail.com>
Reviewed-by: Michael Schmitz <schmitzmic@gmail.com>
Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/NCR5380.c')
| -rw-r--r-- | drivers/scsi/NCR5380.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/drivers/scsi/NCR5380.c b/drivers/scsi/NCR5380.c index d654a6cc4162..ea4b5749e7da 100644 --- a/drivers/scsi/NCR5380.c +++ b/drivers/scsi/NCR5380.c @@ -580,11 +580,14 @@ static int NCR5380_queue_command(struct Scsi_Host *instance, cmd->result = 0; - if (!NCR5380_acquire_dma_irq(instance)) - return SCSI_MLQUEUE_HOST_BUSY; - spin_lock_irqsave(&hostdata->lock, flags); + if (!NCR5380_acquire_dma_irq(instance)) { + spin_unlock_irqrestore(&hostdata->lock, flags); + + return SCSI_MLQUEUE_HOST_BUSY; + } + /* * Insert the cmd into the issue queue. Note that REQUEST SENSE * commands are added to the head of the queue since any command will |