qla2xxx: Prevent probe and board_disable race

The PCI register read checking introduced in commit fe1b806f4f71
("qla2xxx: Disable adapter when we encounter a PCI disconnect") is
active during driver probe. Hold off scheduling any board removal until
the driver probe has completed. This ensures that the the board_disable
work structure is initialized and more importantly, avoids racing
qla2x00_probe_one.

Signed-off-by: Joe Lawrence <joe.lawrence@stratus.com>
Acked-by: Chad Dupuis <chad.dupuis@qlogic.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>

diff --git a/drivers/scsi/qla2xxx/qla_def.h b/drivers/scsi/qla2xxx/qla_def.h
index 1398818..de5a9c4 100644 (file)
--- a/drivers/scsi/qla2xxx/qla_def.h
+++ b/drivers/scsi/qla2xxx/qla_def.h
@@ -3405,6 +3405,7 @@ typedef struct scsi_qla_host {
        unsigned long   pci_flags;
 #define PFLG_DISCONNECTED      0       /* PCI device removed */
 #define PFLG_DRIVER_REMOVING   1       /* PCI driver .remove */
+#define PFLG_DRIVER_PROBING    2       /* PCI driver .probe */
 
        uint32_t        device_flags;
 #define SWITCH_FOUND           BIT_0

diff --git a/drivers/scsi/qla2xxx/qla_isr.c b/drivers/scsi/qla2xxx/qla_isr.c
index 341c64d..a0992bf 100644 (file)
--- a/drivers/scsi/qla2xxx/qla_isr.c
+++ b/drivers/scsi/qla2xxx/qla_isr.c
@@ -118,7 +118,8 @@ qla2x00_check_reg32_for_disconnect(scsi_qla_host_t *vha, uint32_t reg)
        /* Check for PCI disconnection */
        if (reg == 0xffffffff) {
                if (!test_and_set_bit(PFLG_DISCONNECTED, &vha->pci_flags) &&
-                   !test_bit(PFLG_DRIVER_REMOVING, &vha->pci_flags)) {
+                   !test_bit(PFLG_DRIVER_REMOVING, &vha->pci_flags) &&
+                   !test_bit(PFLG_DRIVER_PROBING, &vha->pci_flags)) {
                        /*
                         * Schedule this (only once) on the default system
                         * workqueue so that all the adapter workqueues and the

diff --git a/drivers/scsi/qla2xxx/qla_os.c b/drivers/scsi/qla2xxx/qla_os.c
index 84d4df6..f937859 100644 (file)
--- a/drivers/scsi/qla2xxx/qla_os.c
+++ b/drivers/scsi/qla2xxx/qla_os.c
@@ -2632,6 +2632,7 @@ qla2x00_probe_one(struct pci_dev *pdev, const struct pci_device_id *id)
        }
 
        pci_set_drvdata(pdev, base_vha);
+       set_bit(PFLG_DRIVER_PROBING, &base_vha->pci_flags);
 
        host = base_vha->host;
        base_vha->req = req;
@@ -2928,6 +2929,7 @@ skip_dpc:
 
        qlt_add_target(ha, base_vha);
 
+       clear_bit(PFLG_DRIVER_PROBING, &base_vha->pci_flags);
        return 0;
 
 probe_init_failed: