From: James Bottomley Date: Sun, 23 Jan 2011 14:30:00 +0000 (-0600) Subject: [SCSI] libata: fix locking for sas paths X-Git-Tag: firefly_0821_release~7613^2~2168^2~92 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=b8784f77455124ceb4746e798f7aaf5b3b8a5406;p=firefly-linux-kernel-4.4.55.git [SCSI] libata: fix locking for sas paths For historical reasons, libsas uses the scsi host lock as the ata port lock, and libata always uses the ata host. For the old eh, this was largely irrelevant since the two locks were never mixed inside the code. However, the new eh has a case where it nests acquisition of the host lock inside the port lock (this does look rather deadlock prone). Obviously this would be an instant deadlock if the port lock were the host lock, so switch the libsas paths to use the ata host lock as well. Cc: Tejun Heo Cc: Jeff Garzik Signed-off-by: James Bottomley --- diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c index 897066761359..b935f3a2b010 100644 --- a/drivers/ata/libata-scsi.c +++ b/drivers/ata/libata-scsi.c @@ -3747,7 +3747,7 @@ struct ata_port *ata_sas_port_alloc(struct ata_host *host, return NULL; ap->port_no = 0; - ap->lock = shost->host_lock; + ap->lock = &host->lock; ap->pio_mask = port_info->pio_mask; ap->mwdma_mask = port_info->mwdma_mask; ap->udma_mask = port_info->udma_mask;