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[SCSI] sg: fix incorrect last scatg length 

For certain LLDs the sg driver can cause on oops
when the transfer length is large and not a
multiple of PAGE_SIZE.

  ChangeLog:
    - correct the length of the last scatter gather
      list element.
    - fix some printk()s that have the wrong function
      name.

Signed-off-by: Douglas Gilbert <dougg@torque.net>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
This commit is contained in:
Douglas Gilbert 2006-10-27 17:47:49 -04:00 коммит произвёл James Bottomley
Родитель 4039c30ef5
Коммит 7ca63cb470
1 изменённых файлов: 13 добавлений и 12 удалений
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25
drivers/scsi/sg.c
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@ -60,7 +60,7 @@ static int sg_version_num = 30534; /* 2 digits for each component */
#ifdef CONFIG_SCSI_PROC_FS #ifdef CONFIG_SCSI_PROC_FS
#include <linux/proc_fs.h> #include <linux/proc_fs.h>
static char *sg_version_date = "20060920"; static char *sg_version_date = "20061027";
static int sg_proc_init(void); static int sg_proc_init(void);
static void sg_proc_cleanup(void); static void sg_proc_cleanup(void);
@ -710,12 +710,12 @@ sg_common_write(Sg_fd * sfp, Sg_request * srp,
(int) cmnd[0], (int) hp->cmd_len)); (int) cmnd[0], (int) hp->cmd_len));
if ((k = sg_start_req(srp))) { if ((k = sg_start_req(srp))) {
SCSI_LOG_TIMEOUT(1, printk("sg_write: start_req err=%d\n", k)); SCSI_LOG_TIMEOUT(1, printk("sg_common_write: start_req err=%d\n", k));
sg_finish_rem_req(srp); sg_finish_rem_req(srp);
return k; /* probably out of space --> ENOMEM */ return k; /* probably out of space --> ENOMEM */
} }
if ((k = sg_write_xfer(srp))) { if ((k = sg_write_xfer(srp))) {
SCSI_LOG_TIMEOUT(1, printk("sg_write: write_xfer, bad address\n")); SCSI_LOG_TIMEOUT(1, printk("sg_common_write: write_xfer, bad address\n"));
sg_finish_rem_req(srp); sg_finish_rem_req(srp);
return k; return k;
} }
@ -746,7 +746,7 @@ sg_common_write(Sg_fd * sfp, Sg_request * srp,
hp->dxfer_len, srp->data.k_use_sg, timeout, hp->dxfer_len, srp->data.k_use_sg, timeout,
SG_DEFAULT_RETRIES, srp, sg_cmd_done, SG_DEFAULT_RETRIES, srp, sg_cmd_done,
GFP_ATOMIC)) { GFP_ATOMIC)) {
SCSI_LOG_TIMEOUT(1, printk("sg_write: scsi_execute_async failed\n")); SCSI_LOG_TIMEOUT(1, printk("sg_common_write: scsi_execute_async failed\n"));
/* /*
* most likely out of mem, but could also be a bad map * most likely out of mem, but could also be a bad map
*/ */
@ -1283,7 +1283,7 @@ sg_cmd_done(void *data, char *sense, int result, int resid)
sg_finish_rem_req(srp); sg_finish_rem_req(srp);
srp = NULL; srp = NULL;
if (NULL == sfp->headrp) { if (NULL == sfp->headrp) {
SCSI_LOG_TIMEOUT(1, printk("sg...bh: already closed, final cleanup\n")); SCSI_LOG_TIMEOUT(1, printk("sg_cmd_done: already closed, final cleanup\n"));
if (0 == sg_remove_sfp(sdp, sfp)) { /* device still present */ if (0 == sg_remove_sfp(sdp, sfp)) { /* device still present */
scsi_device_put(sdp->device); scsi_device_put(sdp->device);
} }
@ -1512,12 +1512,12 @@ sg_remove(struct class_device *cl_dev, struct class_interface *cl_intf)
POLL_HUP); POLL_HUP);
} }
} }
SCSI_LOG_TIMEOUT(3, printk("sg_detach: dev=%d, dirty\n", k)); SCSI_LOG_TIMEOUT(3, printk("sg_remove: dev=%d, dirty\n", k));
if (NULL == sdp->headfp) { if (NULL == sdp->headfp) {
sg_dev_arr[k] = NULL; sg_dev_arr[k] = NULL;
} }
} else { /* nothing active, simple case */ } else { /* nothing active, simple case */
SCSI_LOG_TIMEOUT(3, printk("sg_detach: dev=%d\n", k)); SCSI_LOG_TIMEOUT(3, printk("sg_remove: dev=%d\n", k));
sg_dev_arr[k] = NULL; sg_dev_arr[k] = NULL;
} }
sg_nr_dev--; sg_nr_dev--;
@ -1876,14 +1876,15 @@ sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size)
} }
} }
sg->page = p; sg->page = p;
sg->length = ret_sz; sg->length = (ret_sz > num) ? num : ret_sz;
SCSI_LOG_TIMEOUT(5, printk("sg_build_build: k=%d, a=0x%p, len=%d\n", SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k=%d, num=%d, "
k, p, ret_sz)); "ret_sz=%d\n", k, num, ret_sz));
} /* end of for loop */ } /* end of for loop */
schp->k_use_sg = k; schp->k_use_sg = k;
SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k_use_sg=%d, rem_sz=%d\n", k, rem_sz)); SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k_use_sg=%d, "
"rem_sz=%d\n", k, rem_sz));
schp->bufflen = blk_size; schp->bufflen = blk_size;
if (rem_sz > 0) /* must have failed */ if (rem_sz > 0) /* must have failed */
@ -2014,7 +2015,7 @@ sg_remove_scat(Sg_scatter_hold * schp)
for (k = 0; (k < schp->k_use_sg) && sg->page; for (k = 0; (k < schp->k_use_sg) && sg->page;
++k, ++sg) { ++k, ++sg) {
SCSI_LOG_TIMEOUT(5, printk( SCSI_LOG_TIMEOUT(5, printk(
"sg_remove_scat: k=%d, a=0x%p, len=%d\n", "sg_remove_scat: k=%d, pg=0x%p, len=%d\n",
k, sg->page, sg->length)); k, sg->page, sg->length));
sg_page_free(sg->page, sg->length); sg_page_free(sg->page, sg->length);
} }