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path: root/drivers/scsi/scsi_scan.c
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Diffstat (limited to 'drivers/scsi/scsi_scan.c')
-rw-r--r--drivers/scsi/scsi_scan.c54
1 files changed, 15 insertions, 39 deletions
diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c
index 983aed10ff2f..0deb385ad4d6 100644
--- a/drivers/scsi/scsi_scan.c
+++ b/drivers/scsi/scsi_scan.c
@@ -34,6 +34,7 @@
#include <linux/spinlock.h>
#include <linux/async.h>
#include <linux/slab.h>
+#include <asm/unaligned.h>
#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>
@@ -98,20 +99,6 @@ char scsi_scan_type[6] = SCSI_SCAN_TYPE_DEFAULT;
module_param_string(scan, scsi_scan_type, sizeof(scsi_scan_type), S_IRUGO);
MODULE_PARM_DESC(scan, "sync, async or none");
-/*
- * max_scsi_report_luns: the maximum number of LUNS that will be
- * returned from the REPORT LUNS command. 8 times this value must
- * be allocated. In theory this could be up to an 8 byte value, but
- * in practice, the maximum number of LUNs suppored by any device
- * is about 16k.
- */
-static unsigned int max_scsi_report_luns = 511;
-
-module_param_named(max_report_luns, max_scsi_report_luns, uint, S_IRUGO|S_IWUSR);
-MODULE_PARM_DESC(max_report_luns,
- "REPORT LUNS maximum number of LUNS received (should be"
- " between 1 and 16384)");
-
static unsigned int scsi_inq_timeout = SCSI_TIMEOUT/HZ + 18;
module_param_named(inq_timeout, scsi_inq_timeout, uint, S_IRUGO|S_IWUSR);
@@ -1367,7 +1354,6 @@ static int scsi_report_lun_scan(struct scsi_target *starget, int bflags,
unsigned int retries;
int result;
struct scsi_lun *lunp, *lun_data;
- u8 *data;
struct scsi_sense_hdr sshdr;
struct scsi_device *sdev;
struct Scsi_Host *shost = dev_to_shost(&starget->dev);
@@ -1407,16 +1393,12 @@ static int scsi_report_lun_scan(struct scsi_target *starget, int bflags,
/*
* Allocate enough to hold the header (the same size as one scsi_lun)
- * plus the max number of luns we are requesting.
- *
- * Reallocating and trying again (with the exact amount we need)
- * would be nice, but then we need to somehow limit the size
- * allocated based on the available memory and the limits of
- * kmalloc - we don't want a kmalloc() failure of a huge value to
- * prevent us from finding any LUNs on this target.
+ * plus the number of luns we are requesting. 511 was the default
+ * value of the now removed max_report_luns parameter.
*/
- length = (max_scsi_report_luns + 1) * sizeof(struct scsi_lun);
- lun_data = kmalloc(length, GFP_ATOMIC |
+ length = (511 + 1) * sizeof(struct scsi_lun);
+retry:
+ lun_data = kmalloc(length, GFP_KERNEL |
(sdev->host->unchecked_isa_dma ? __GFP_DMA : 0));
if (!lun_data) {
printk(ALLOC_FAILURE_MSG, __func__);
@@ -1433,10 +1415,7 @@ static int scsi_report_lun_scan(struct scsi_target *starget, int bflags,
/*
* bytes 6 - 9: length of the command.
*/
- scsi_cmd[6] = (unsigned char) (length >> 24) & 0xff;
- scsi_cmd[7] = (unsigned char) (length >> 16) & 0xff;
- scsi_cmd[8] = (unsigned char) (length >> 8) & 0xff;
- scsi_cmd[9] = (unsigned char) length & 0xff;
+ put_unaligned_be32(length, &scsi_cmd[6]);
scsi_cmd[10] = 0; /* reserved */
scsi_cmd[11] = 0; /* control */
@@ -1484,19 +1463,16 @@ static int scsi_report_lun_scan(struct scsi_target *starget, int bflags,
/*
* Get the length from the first four bytes of lun_data.
*/
- data = (u8 *) lun_data->scsi_lun;
- length = ((data[0] << 24) | (data[1] << 16) |
- (data[2] << 8) | (data[3] << 0));
+ if (get_unaligned_be32(lun_data->scsi_lun) +
+ sizeof(struct scsi_lun) > length) {
+ length = get_unaligned_be32(lun_data->scsi_lun) +
+ sizeof(struct scsi_lun);
+ kfree(lun_data);
+ goto retry;
+ }
+ length = get_unaligned_be32(lun_data->scsi_lun);
num_luns = (length / sizeof(struct scsi_lun));
- if (num_luns > max_scsi_report_luns) {
- sdev_printk(KERN_WARNING, sdev,
- "Only %d (max_scsi_report_luns)"
- " of %d luns reported, try increasing"
- " max_scsi_report_luns.\n",
- max_scsi_report_luns, num_luns);
- num_luns = max_scsi_report_luns;
- }
SCSI_LOG_SCAN_BUS(3, sdev_printk (KERN_INFO, sdev,
"scsi scan: REPORT LUN scan\n"));