The RTPG buffer will only evaluated within alua_rtpg(),
so we can allocate it locally there and avoid having to
put it into the global structure.
Reviewed-by: Ewan Milne <emilne@xxxxxxxxxx>
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
Signed-off-by: Hannes Reinecke <hare@xxxxxxx>
---
drivers/scsi/device_handler/scsi_dh_alua.c | 57 ++++++++++++------------------
1 file changed, 23 insertions(+), 34 deletions(-)
diff --git a/drivers/scsi/device_handler/scsi_dh_alua.c b/drivers/scsi/device_handler/scsi_dh_alua.c
index 73df60e..af5acc1 100644
--- a/drivers/scsi/device_handler/scsi_dh_alua.c
+++ b/drivers/scsi/device_handler/scsi_dh_alua.c
@@ -56,7 +56,7 @@
#define TPGS_MODE_IMPLICIT 0x1
#define TPGS_MODE_EXPLICIT 0x2
-#define ALUA_INQUIRY_SIZE 36
+#define ALUA_RTPG_SIZE 128
#define ALUA_FAILOVER_TIMEOUT 60
#define ALUA_FAILOVER_RETRIES 5
@@ -71,9 +71,6 @@ struct alua_dh_data {
int state;
int pref;
unsigned flags; /* used for optimizing STPG */
- unsigned char inq[ALUA_INQUIRY_SIZE];
- unsigned char *buff;
- int bufflen;
unsigned char transition_tmo;
struct scsi_device *sdev;
activate_complete callback_fn;
@@ -85,21 +82,6 @@ struct alua_dh_data {
static char print_alua_state(int);
-static int realloc_buffer(struct alua_dh_data *h, unsigned len)
-{
- if (h->buff && h->buff != h->inq)
- kfree(h->buff);
-
- h->buff = kmalloc(len, GFP_NOIO);
- if (!h->buff) {
- h->buff = h->inq;
- h->bufflen = ALUA_INQUIRY_SIZE;
- return 1;
- }
- h->bufflen = len;
- return 0;
-}
-
/*
* submit_rtpg - Issue a REPORT TARGET GROUP STATES command
* @sdev: sdev the command should be sent to
@@ -333,8 +315,8 @@ static int alua_check_sense(struct scsi_device *sdev,
static int alua_rtpg(struct scsi_device *sdev, struct alua_dh_data *h, int wait_for_transition)
{
struct scsi_sense_hdr sense_hdr;
- int len, k, off, valid_states = 0;
- unsigned char *ucp;
+ int len, k, off, valid_states = 0, bufflen = ALUA_RTPG_SIZE;
+ unsigned char *ucp, *buff;
unsigned err, retval;
unsigned long expiry, interval = 0;
unsigned int tpg_desc_tbl_off;
@@ -345,14 +327,19 @@ static int alua_rtpg(struct scsi_device *sdev, struct alua_dh_data *h, int wait_
else
expiry = round_jiffies_up(jiffies + h->transition_tmo * HZ);
+ buff = kzalloc(bufflen, GFP_KERNEL);
+ if (!buff)
+ return SCSI_DH_DEV_TEMP_BUSY;
+
retry:
- retval = submit_rtpg(sdev, h->buff, h->bufflen, &sense_hdr, h->flags);
+ retval = submit_rtpg(sdev, buff, bufflen, &sense_hdr, h->flags);
if (retval) {
if (!scsi_sense_valid(&sense_hdr)) {
sdev_printk(KERN_INFO, sdev,
"%s: rtpg failed, result %d\n",
ALUA_DH_NAME, retval);
+ kfree(buff);
if (driver_byte(retval) == DRIVER_ERROR)
return SCSI_DH_DEV_TEMP_BUSY;
return SCSI_DH_IO;
@@ -390,14 +377,18 @@ static int alua_rtpg(struct scsi_device *sdev, struct alua_dh_data *h, int wait_
sdev_printk(KERN_ERR, sdev, "%s: rtpg failed\n",
ALUA_DH_NAME);
scsi_print_sense_hdr(sdev, ALUA_DH_NAME, &sense_hdr);
+ kfree(buff);
return SCSI_DH_IO;
}
- len = get_unaligned_be32(&h->buff[0]) + 4;
+ len = get_unaligned_be32(&buff[0]) + 4;
- if (len > h->bufflen) {
+ if (len > bufflen) {
/* Resubmit with the correct length */
- if (realloc_buffer(h, len)) {
+ kfree(buff);
+ bufflen = len;
+ buff = kmalloc(bufflen, GFP_KERNEL);
+ if (!buff) {
sdev_printk(KERN_WARNING, sdev,
"%s: kmalloc buffer failed\n",__func__);
/* Temporary failure, bypass */
@@ -407,24 +398,25 @@ static int alua_rtpg(struct scsi_device *sdev, struct alua_dh_data *h, int wait_
}
orig_transition_tmo = h->transition_tmo;
- if ((h->buff[4] & RTPG_FMT_MASK) == RTPG_FMT_EXT_HDR && h->buff[5] != 0)
- h->transition_tmo = h->buff[5];
+ if ((buff[4] & RTPG_FMT_MASK) == RTPG_FMT_EXT_HDR && buff[5] != 0)
+ h->transition_tmo = buff[5];
else
h->transition_tmo = ALUA_FAILOVER_TIMEOUT;
- if (wait_for_transition && (orig_transition_tmo != h->transition_tmo)) {
+ if (wait_for_transition &&
+ (orig_transition_tmo != h->transition_tmo)) {
sdev_printk(KERN_INFO, sdev,
"%s: transition timeout set to %d seconds\n",
ALUA_DH_NAME, h->transition_tmo);
expiry = jiffies + h->transition_tmo * HZ;
}
- if ((h->buff[4] & RTPG_FMT_MASK) == RTPG_FMT_EXT_HDR)
+ if ((buff[4] & RTPG_FMT_MASK) == RTPG_FMT_EXT_HDR)
tpg_desc_tbl_off = 8;
else
tpg_desc_tbl_off = 4;
- for (k = tpg_desc_tbl_off, ucp = h->buff + tpg_desc_tbl_off;
+ for (k = tpg_desc_tbl_off, ucp = buff + tpg_desc_tbl_off;
k < len;
k += off, ucp += off) {
@@ -474,6 +466,7 @@ static int alua_rtpg(struct scsi_device *sdev, struct alua_dh_data *h, int wait_
err = SCSI_DH_OK;
break;
}
+ kfree(buff);
return err;
}
@@ -668,8 +661,6 @@ static int alua_bus_attach(struct scsi_device *sdev)
h->state = TPGS_STATE_OPTIMIZED;
h->group_id = -1;
h->rel_port = -1;
- h->buff = h->inq;
- h->bufflen = ALUA_INQUIRY_SIZE;
h->sdev = sdev;
err = alua_initialize(sdev, h);
@@ -691,8 +682,6 @@ static void alua_bus_detach(struct scsi_device *sdev)
{
struct alua_dh_data *h = sdev->handler_data;
- if (h->buff && h->inq != h->buff)
- kfree(h->buff);
sdev->handler_data = NULL;
kfree(h);
}
--
1.8.5.6
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