[libata] wrap kmap_atomic(KM_IRQ0) with local_irq_save/restore()

Interrupts must be disabled if using kmap_atomic(KM_IRQ0), but that was
not the case in a few code paths coming directly from ATA driver
interrupt handlers (which use spin_lock rather than spin_lock_irqsave).

Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index 0562b0a49f3b..7b1f1ee8131d 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -1694,12 +1694,17 @@ void ata_scsi_rbuf_fill(struct ata_scsi_args *args,
         u8 *rbuf;
         unsigned int buflen, rc;
         struct scsi_cmnd *cmd = args->cmd;
+        unsigned long flags;
+
+        local_irq_save(flags);
 
         buflen = ata_scsi_rbuf_get(cmd, &rbuf);
         memset(rbuf, 0, buflen);
         rc = actor(args, rbuf, buflen);
         ata_scsi_rbuf_put(cmd, rbuf);
 
+        local_irq_restore(flags);
+
         if (rc == 0)
                 cmd->result = SAM_STAT_GOOD;
         args->done(cmd);
@@ -2473,6 +2478,9 @@ static void atapi_qc_complete(struct ata_queued_cmd *qc)
                 if ((scsicmd[0] == INQUIRY) && ((scsicmd[1] & 0x03) == 0)) {
                         u8 *buf = NULL;
                         unsigned int buflen;
+                        unsigned long flags;
+
+                        local_irq_save(flags);
 
                         buflen = ata_scsi_rbuf_get(cmd, &buf);
 
@@ -2490,6 +2498,8 @@ static void atapi_qc_complete(struct ata_queued_cmd *qc)
                         }
 
                         ata_scsi_rbuf_put(cmd, buf);
+
+                        local_irq_restore(flags);
                 }
 
                 cmd->result = SAM_STAT_GOOD;