diff options
| author | Dexuan Cui <decui@microsoft.com> | 2021-10-07 21:35:46 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-10-27 09:51:41 +0200 |
| commit | 249955c18297e332615da883422331fe75b8f442 (patch) | |
| tree | 3d23a4203398e808d68f51331557411028ab8240 | |
| parent | 840c7109c72b1e6c3ec872e94cd6ca6eaf7f541a (diff) | |
scsi: core: Fix shost->cmd_per_lun calculation in scsi_add_host_with_dma()
commit 50b6cb3516365cb69753b006be2b61c966b70588 upstream.
After commit ea2f0f77538c ("scsi: core: Cap scsi_host cmd_per_lun at
can_queue"), a 416-CPU VM running on Hyper-V hangs during boot because the
hv_storvsc driver sets scsi_driver.can_queue to an integer value that
exceeds SHRT_MAX, and hence scsi_add_host_with_dma() sets
shost->cmd_per_lun to a negative "short" value.
Use min_t(int, ...) to work around the issue.
Link: https://lore.kernel.org/r/20211008043546.6006-1-decui@microsoft.com
Fixes: ea2f0f77538c ("scsi: core: Cap scsi_host cmd_per_lun at can_queue")
Cc: stable@vger.kernel.org
Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Reviewed-by: John Garry <john.garry@huawei.com>
Signed-off-by: Dexuan Cui <decui@microsoft.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/scsi/hosts.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/scsi/hosts.c b/drivers/scsi/hosts.c index ec976b93341c..27609b2ae544 100644 --- a/drivers/scsi/hosts.c +++ b/drivers/scsi/hosts.c @@ -213,7 +213,8 @@ int scsi_add_host_with_dma(struct Scsi_Host *shost, struct device *dev, goto fail; } - shost->cmd_per_lun = min_t(short, shost->cmd_per_lun, + /* Use min_t(int, ...) in case shost->can_queue exceeds SHRT_MAX */ + shost->cmd_per_lun = min_t(int, shost->cmd_per_lun, shost->can_queue); error = scsi_init_sense_cache(shost); |