[SCSI] qla2xxx: fix to honor ignored parameters in sysfs attributes
This is a patch to fix 'segmentation fault' issue which was initiated
by Richard Lary <rlary@us.ibm.com>. Thanks again Richard.
- on following sysfs attritute function, changes have made so that both
count and offset input parameters are honored by the functions.
= qla2x00_sysfs_read_nvram()
= qla2x00_sysfs_read_vpd()
- made changes so that NVRAM data to be cached to minimize H/W accesses
during agent querying of the driver's.
Signed-off-by: Seokmann Ju <seokmann.ju@qlogic.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
diff --git a/drivers/scsi/qla2xxx/qla_attr.c b/drivers/scsi/qla2xxx/qla_attr.c
index 1612f92..0f2a9f5 100644
--- a/drivers/scsi/qla2xxx/qla_attr.c
+++ b/drivers/scsi/qla2xxx/qla_attr.c
@@ -91,18 +91,20 @@
{
struct scsi_qla_host *ha = to_qla_host(dev_to_shost(container_of(kobj,
struct device, kobj)));
- unsigned long flags;
+ int size = ha->nvram_size;
+ char *nvram_cache = ha->nvram;
- if (!capable(CAP_SYS_ADMIN) || off != 0)
+ if (!capable(CAP_SYS_ADMIN) || off > size || count == 0)
return 0;
+ if (off + count > size) {
+ size -= off;
+ count = size;
+ }
- /* Read NVRAM. */
- spin_lock_irqsave(&ha->hardware_lock, flags);
- ha->isp_ops->read_nvram(ha, (uint8_t *)buf, ha->nvram_base,
- ha->nvram_size);
- spin_unlock_irqrestore(&ha->hardware_lock, flags);
+ /* Read NVRAM data from cache. */
+ memcpy(buf, &nvram_cache[off], count);
- return ha->nvram_size;
+ return count;
}
static ssize_t
@@ -144,6 +146,8 @@
/* Write NVRAM. */
spin_lock_irqsave(&ha->hardware_lock, flags);
ha->isp_ops->write_nvram(ha, (uint8_t *)buf, ha->nvram_base, count);
+ ha->isp_ops->read_nvram(ha, (uint8_t *)&ha->nvram, ha->nvram_base,
+ count);
spin_unlock_irqrestore(&ha->hardware_lock, flags);
set_bit(ISP_ABORT_NEEDED, &ha->dpc_flags);
@@ -298,18 +302,20 @@
{
struct scsi_qla_host *ha = to_qla_host(dev_to_shost(container_of(kobj,
struct device, kobj)));
- unsigned long flags;
+ int size = ha->vpd_size;
+ char *vpd_cache = ha->vpd;
- if (!capable(CAP_SYS_ADMIN) || off != 0)
+ if (!capable(CAP_SYS_ADMIN) || off > size || count == 0)
return 0;
+ if (off + count > size) {
+ size -= off;
+ count = size;
+ }
- /* Read NVRAM. */
- spin_lock_irqsave(&ha->hardware_lock, flags);
- ha->isp_ops->read_nvram(ha, (uint8_t *)buf, ha->vpd_base,
- ha->vpd_size);
- spin_unlock_irqrestore(&ha->hardware_lock, flags);
+ /* Read NVRAM data from cache. */
+ memcpy(buf, &vpd_cache[off], count);
- return ha->vpd_size;
+ return count;
}
static ssize_t
@@ -327,6 +333,7 @@
/* Write NVRAM. */
spin_lock_irqsave(&ha->hardware_lock, flags);
ha->isp_ops->write_nvram(ha, (uint8_t *)buf, ha->vpd_base, count);
+ ha->isp_ops->read_nvram(ha, (uint8_t *)ha->vpd, ha->vpd_base, count);
spin_unlock_irqrestore(&ha->hardware_lock, flags);
return count;