From: Dexuan Cui decui@microsoft.com
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 --- drivers/scsi/hosts.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
--- a/drivers/scsi/hosts.c +++ b/drivers/scsi/hosts.c @@ -218,7 +218,8 @@ int scsi_add_host_with_dma(struct Scsi_H 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);