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[SCSI] ibmvfc: Fix DMA mapping leak on memory allocation failure 

There is currently a DMA mapping leak that can occur in the ibmvfc
driver if we fail to allocate a scatterlist. Fix this by unmapping
the scatterlist in the failure path. Additionally, only log an error
for a scatterlist allocation failure if the log level is greater
than the default, since this can occur when running Active Memory
Sharing and this is not considered an error.

Signed-off-by: Brian King <brking@linux.vnet.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
This commit is contained in:
Brian King 2009-01-22 15:45:38 -06:00 committed by James Bottomley
parent f9932deb99
commit 64b840dd88
1 changed files with 3 additions and 1 deletions
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4
drivers/scsi/ibmvscsi/ibmvfc.c
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@ -1322,7 +1322,9 @@ static int ibmvfc_map_sg_data(struct scsi_cmnd *scmd,
&evt->ext_list_token);
if (!evt->ext_list) {
scmd_printk(KERN_ERR, scmd, "Can't allocate memory for scatterlist\n");
scsi_dma_unmap(scmd);
if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
scmd_printk(KERN_ERR, scmd, "Can't allocate memory for scatterlist\n");
return -ENOMEM;
}
}