diff options
| 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 | |
| parent | scsi: ufs: Adjust logic in common ADAPT helper (diff) | |
| download | linux-dev-03fe6a640a05c5dc04b6bcdddfb981d015e84ed4.tar.xz linux-dev-03fe6a640a05c5dc04b6bcdddfb981d015e84ed4.zip | |
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>
| -rw-r--r-- | drivers/scsi/NCR5380.c | 9 | ||||
| -rw-r--r-- | drivers/scsi/atari_scsi.c | 10 |
2 files changed, 9 insertions, 10 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 diff --git a/drivers/scsi/atari_scsi.c b/drivers/scsi/atari_scsi.c index a82b63a66635..95d7a3586083 100644 --- a/drivers/scsi/atari_scsi.c +++ b/drivers/scsi/atari_scsi.c @@ -376,15 +376,11 @@ static int falcon_get_lock(struct Scsi_Host *instance) if (IS_A_TT()) return 1; - if (stdma_is_locked_by(scsi_falcon_intr) && - instance->hostt->can_queue > 1) + if (stdma_is_locked_by(scsi_falcon_intr)) return 1; - if (in_interrupt()) - return stdma_try_lock(scsi_falcon_intr, instance); - - stdma_lock(scsi_falcon_intr, instance); - return 1; + /* stdma_lock() may sleep which means it can't be used here */ + return stdma_try_lock(scsi_falcon_intr, instance); } #ifndef MODULE |