[SCSI] qla2xxx: Add mutex around optrom calls to serialize accesses.

[firefly-linux-kernel-4.4.55.git] / drivers / scsi / qla2xxx / qla_attr.c

diff --git a/drivers/scsi/qla2xxx/qla_attr.c b/drivers/scsi/qla2xxx/qla_attr.c
index 4a0d7c92181f974730b7964a029822ef4a565297..c2144412859b85dfc2fdbfb8b184a45494a36692 100644 (file)
--- a/drivers/scsi/qla2xxx/qla_attr.c
+++ b/drivers/scsi/qla2xxx/qla_attr.c
@@ -241,12 +241,17 @@ qla2x00_sysfs_read_optrom(struct file *filp, struct kobject *kobj,
        struct scsi_qla_host *vha = shost_priv(dev_to_shost(container_of(kobj,
            struct device, kobj)));
        struct qla_hw_data *ha = vha->hw;
+       ssize_t rval = 0;
 
        if (ha->optrom_state != QLA_SREADING)
                return 0;
 
-       return memory_read_from_buffer(buf, count, &off, ha->optrom_buffer,
-                                       ha->optrom_region_size);
+       mutex_lock(&ha->optrom_mutex);
+       rval = memory_read_from_buffer(buf, count, &off, ha->optrom_buffer,
+           ha->optrom_region_size);
+       mutex_unlock(&ha->optrom_mutex);
+
+       return rval;
 }
 
 static ssize_t
@@ -265,7 +270,9 @@ qla2x00_sysfs_write_optrom(struct file *filp, struct kobject *kobj,
        if (off + count > ha->optrom_region_size)
                count = ha->optrom_region_size - off;
 
+       mutex_lock(&ha->optrom_mutex);
        memcpy(&ha->optrom_buffer[off], buf, count);
+       mutex_unlock(&ha->optrom_mutex);
 
        return count;
 }
@@ -288,10 +295,10 @@ qla2x00_sysfs_write_optrom_ctl(struct file *filp, struct kobject *kobj,
        struct scsi_qla_host *vha = shost_priv(dev_to_shost(container_of(kobj,
            struct device, kobj)));
        struct qla_hw_data *ha = vha->hw;
-
        uint32_t start = 0;
        uint32_t size = ha->optrom_size;
        int val, valid;
+       ssize_t rval = count;
 
        if (off)
                return -EINVAL;
@@ -304,12 +311,14 @@ qla2x00_sysfs_write_optrom_ctl(struct file *filp, struct kobject *kobj,
        if (start > ha->optrom_size)
                return -EINVAL;
 
+       mutex_lock(&ha->optrom_mutex);
        switch (val) {
        case 0:
                if (ha->optrom_state != QLA_SREADING &&
-                   ha->optrom_state != QLA_SWRITING)
-                       return -EINVAL;
-
+                   ha->optrom_state != QLA_SWRITING) {
+                       rval =  -EINVAL;
+                       goto out;
+               }
                ha->optrom_state = QLA_SWAITING;
 
                ql_dbg(ql_dbg_user, vha, 0x7061,
@@ -320,8 +329,10 @@ qla2x00_sysfs_write_optrom_ctl(struct file *filp, struct kobject *kobj,
                ha->optrom_buffer = NULL;
                break;
        case 1:
-               if (ha->optrom_state != QLA_SWAITING)
-                       return -EINVAL;
+               if (ha->optrom_state != QLA_SWAITING) {
+                       rval = -EINVAL;
+                       goto out;
+               }
 
                ha->optrom_region_start = start;
                ha->optrom_region_size = start + size > ha->optrom_size ?
@@ -335,13 +346,15 @@ qla2x00_sysfs_write_optrom_ctl(struct file *filp, struct kobject *kobj,
                            "(%x).\n", ha->optrom_region_size);
 
                        ha->optrom_state = QLA_SWAITING;
-                       return -ENOMEM;
+                       rval = -ENOMEM;
+                       goto out;
                }
 
                if (qla2x00_wait_for_hba_online(vha) != QLA_SUCCESS) {
                        ql_log(ql_log_warn, vha, 0x7063,
                            "HBA not online, failing NVRAM update.\n");
-                       return -EAGAIN;
+                       rval = -EAGAIN;
+                       goto out;
                }
 
                ql_dbg(ql_dbg_user, vha, 0x7064,
@@ -353,8 +366,10 @@ qla2x00_sysfs_write_optrom_ctl(struct file *filp, struct kobject *kobj,
                    ha->optrom_region_start, ha->optrom_region_size);
                break;
        case 2:
-               if (ha->optrom_state != QLA_SWAITING)
-                       return -EINVAL;
+               if (ha->optrom_state != QLA_SWAITING) {
+                       rval = -EINVAL;
+                       goto out;
+               }
 
                /*
                 * We need to be more restrictive on which FLASH regions are
@@ -388,7 +403,8 @@ qla2x00_sysfs_write_optrom_ctl(struct file *filp, struct kobject *kobj,
                if (!valid) {
                        ql_log(ql_log_warn, vha, 0x7065,
                            "Invalid start region 0x%x/0x%x.\n", start, size);
-                       return -EINVAL;
+                       rval = -EINVAL;
+                       goto out;
                }
 
                ha->optrom_region_start = start;
@@ -403,7 +419,8 @@ qla2x00_sysfs_write_optrom_ctl(struct file *filp, struct kobject *kobj,
                            "(%x)\n", ha->optrom_region_size);
 
                        ha->optrom_state = QLA_SWAITING;
-                       return -ENOMEM;
+                       rval = -ENOMEM;
+                       goto out;
                }
 
                ql_dbg(ql_dbg_user, vha, 0x7067,
@@ -413,13 +430,16 @@ qla2x00_sysfs_write_optrom_ctl(struct file *filp, struct kobject *kobj,
                memset(ha->optrom_buffer, 0, ha->optrom_region_size);
                break;
        case 3:
-               if (ha->optrom_state != QLA_SWRITING)
-                       return -EINVAL;
+               if (ha->optrom_state != QLA_SWRITING) {
+                       rval = -EINVAL;
+                       goto out;
+               }
 
                if (qla2x00_wait_for_hba_online(vha) != QLA_SUCCESS) {
                        ql_log(ql_log_warn, vha, 0x7068,
                            "HBA not online, failing flash update.\n");
-                       return -EAGAIN;
+                       rval = -EAGAIN;
+                       goto out;
                }
 
                ql_dbg(ql_dbg_user, vha, 0x7069,
@@ -430,9 +450,12 @@ qla2x00_sysfs_write_optrom_ctl(struct file *filp, struct kobject *kobj,
                    ha->optrom_region_start, ha->optrom_region_size);
                break;
        default:
-               return -EINVAL;
+               rval = -EINVAL;
        }
-       return count;
+
+out:
+       mutex_unlock(&ha->optrom_mutex);
+       return rval;
 }
 
 static struct bin_attribute sysfs_optrom_ctl_attr = {