[SCSI] ibmvscsi: Misc. locking fixes

Fix a couple locking bugs discovered during code inspection.
ibmvscsi_send_srp_event needs to be called with the host lock
held. This patch fixes a couple paths in the code where this
wasn't true.

Signed-off-by: Brian King <brking@linux.vnet.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

diff --git a/drivers/scsi/ibmvscsi/ibmvscsi.c b/drivers/scsi/ibmvscsi/ibmvscsi.c
index 0a16972..934bcad 100644 (file)
--- a/drivers/scsi/ibmvscsi/ibmvscsi.c
+++ b/drivers/scsi/ibmvscsi/ibmvscsi.c
@@ -845,6 +845,7 @@ static void send_mad_adapter_info(struct ibmvscsi_host_data *hostdata)
 {
        struct viosrp_adapter_info *req;
        struct srp_event_struct *evt_struct;
+       unsigned long flags;
        dma_addr_t addr;
 
        evt_struct = get_event_struct(&hostdata->pool);
@@ -875,6 +876,7 @@ static void send_mad_adapter_info(struct ibmvscsi_host_data *hostdata)
                return;
        }
        
+       spin_lock_irqsave(hostdata->host->host_lock, flags);
        if (ibmvscsi_send_srp_event(evt_struct, hostdata, init_timeout * 2)) {
                dev_err(hostdata->dev, "couldn't send ADAPTER_INFO_REQ!\n");
                dma_unmap_single(hostdata->dev,
@@ -882,6 +884,7 @@ static void send_mad_adapter_info(struct ibmvscsi_host_data *hostdata)
                                 sizeof(hostdata->madapter_info),
                                 DMA_BIDIRECTIONAL);
        }
+       spin_unlock_irqrestore(hostdata->host->host_lock, flags);
 };
 
 /**
@@ -1357,6 +1360,7 @@ static int ibmvscsi_do_host_config(struct ibmvscsi_host_data *hostdata,
 {
        struct viosrp_host_config *host_config;
        struct srp_event_struct *evt_struct;
+       unsigned long flags;
        dma_addr_t addr;
        int rc;
 
@@ -1388,7 +1392,9 @@ static int ibmvscsi_do_host_config(struct ibmvscsi_host_data *hostdata,
        }
 
        init_completion(&evt_struct->comp);
+       spin_lock_irqsave(hostdata->host->host_lock, flags);
        rc = ibmvscsi_send_srp_event(evt_struct, hostdata, init_timeout * 2);
+       spin_unlock_irqrestore(hostdata->host->host_lock, flags);
        if (rc == 0)
                wait_for_completion(&evt_struct->comp);
        dma_unmap_single(hostdata->dev, addr, length, DMA_BIDIRECTIONAL);