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| author | Tejun Heo <htejun@gmail.com> | 2006-06-12 22:51:14 +0900 |
|---|---|---|
| committer | Jeff Garzik <jeff@garzik.org> | 2006-06-12 10:23:21 -0400 |
| commit | d01712698c7c52bc71f41192e864dccc90a1217d (patch) | |
| tree | f7736e757162618bb7f1dbebe3f60a78f861a49a | |
| parent | d4c85325a817d3351e61c4be64b437116e8483b4 (diff) | |
| download | blackbird-op-linux-d01712698c7c52bc71f41192e864dccc90a1217d.tar.gz blackbird-op-linux-d01712698c7c52bc71f41192e864dccc90a1217d.zip | |
[PATCH] libata: fix oops caused rescanning NULL sdev
Depending on timing, ata_scsi_dev_rescan() might encounter a device
which is enabled but not yet attached to sdev. On such cases, the
original code caused oops. This patch makes ata_scsi_dev_rescan()
rescan only device which are attached to sdevs.
While at it, properly indent leading comment and add description about
how it's synchronized with sdev attach/detach.
Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
| -rw-r--r-- | drivers/scsi/libata-scsi.c | 17 |
1 files changed, 9 insertions, 8 deletions
diff --git a/drivers/scsi/libata-scsi.c b/drivers/scsi/libata-scsi.c index 45a49be65042..32c1df69091b 100644 --- a/drivers/scsi/libata-scsi.c +++ b/drivers/scsi/libata-scsi.c @@ -3005,14 +3005,16 @@ static int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel, } /** - * ata_scsi_dev_rescan - initiate scsi_rescan_device() - * @data: Pointer to ATA port to perform scsi_rescan_device() + * ata_scsi_dev_rescan - initiate scsi_rescan_device() + * @data: Pointer to ATA port to perform scsi_rescan_device() * - * After ATA pass thru (SAT) commands are executed successfully, - * libata need to propagate the changes to SCSI layer. + * After ATA pass thru (SAT) commands are executed successfully, + * libata need to propagate the changes to SCSI layer. This + * function must be executed from ata_aux_wq such that sdev + * attach/detach don't race with rescan. * - * LOCKING: - * Kernel thread context (may sleep). + * LOCKING: + * Kernel thread context (may sleep). */ void ata_scsi_dev_rescan(void *data) { @@ -3023,8 +3025,7 @@ void ata_scsi_dev_rescan(void *data) for (i = 0; i < ATA_MAX_DEVICES; i++) { dev = &ap->device[i]; - if (ata_dev_enabled(dev)) + if (ata_dev_enabled(dev) && dev->sdev) scsi_rescan_device(&(dev->sdev->sdev_gendev)); } } - |
