[SCSI] qla2xxx: ABBA lock ordering fix.

In qla2x00_reset_chip the driver first takes the hardware lock,
and then later on takes the mbx lock.

In the mailbox_command code.. it goes the other way around.

Discovered with the lock validator.

Cc: Ingo Molnar <mingo@elte.hu>
Cc: Arjan van de Ven <arjan@infradead.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Andrew Vasquez <andrew.vasquez@qlogic.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

diff --git a/drivers/scsi/qla2xxx/qla_init.c b/drivers/scsi/qla2xxx/qla_init.c
index 1cf27fe..1289a18 100644 (file)
--- a/drivers/scsi/qla2xxx/qla_init.c
+++ b/drivers/scsi/qla2xxx/qla_init.c
@@ -411,7 +411,6 @@ qla2x00_reset_chip(scsi_qla_host_t *ha)
        unsigned long   flags = 0;
        struct device_reg_2xxx __iomem *reg = &ha->iobase->isp;
        uint32_t        cnt;
-       unsigned long   mbx_flags = 0;
        uint16_t        cmd;
 
        ha->isp_ops.disable_intrs(ha);
@@ -519,20 +518,8 @@ qla2x00_reset_chip(scsi_qla_host_t *ha)
 
        if (IS_QLA2100(ha) || IS_QLA2200(ha) || IS_QLA2300(ha)) {
                for (cnt = 0; cnt < 30000; cnt++) {
-                       if (!(test_bit(ABORT_ISP_ACTIVE, &ha->dpc_flags)))
-                               spin_lock_irqsave(&ha->mbx_reg_lock, mbx_flags);
-
-                       if (RD_MAILBOX_REG(ha, reg, 0) != MBS_BUSY) {
-                               if (!(test_bit(ABORT_ISP_ACTIVE,
-                                   &ha->dpc_flags)))
-                                       spin_unlock_irqrestore(
-                                           &ha->mbx_reg_lock, mbx_flags);
+                       if (RD_MAILBOX_REG(ha, reg, 0) != MBS_BUSY)
                                break;
-                       }
-
-                       if (!(test_bit(ABORT_ISP_ACTIVE, &ha->dpc_flags)))
-                               spin_unlock_irqrestore(&ha->mbx_reg_lock,
-                                   mbx_flags);
 
                        udelay(100);
                }