On Fri, Jun 12, 2015 at 03:12:27PM +0530, Sreekanth Reddy wrote:
> scsi_dma_map API will return a negative value (i.e. -ENOMEM)
> if DMA mapping of sg lists fails and zero if the sg list in the
> SCSI cmd is NULL. But drivers doesn't handled sg list DMA mapping
> failure case properly.
> 
> So, Updated the code to return host busy error status to SCSI MID Layer(SML),
> when DMA mapping of scatter gather list fails for a SCSI command.
> So that SML will retry this SCSI cmd after some time.
> 
> Signed-off-by: Sreekanth Reddy <sreekanth.re...@avagotech.com>
> ---
>  drivers/scsi/mpt3sas/mpt3sas_base.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/scsi/mpt3sas/mpt3sas_base.c 
> b/drivers/scsi/mpt3sas/mpt3sas_base.c
> index 267e489..0b26c8d 100644
> --- a/drivers/scsi/mpt3sas/mpt3sas_base.c
> +++ b/drivers/scsi/mpt3sas/mpt3sas_base.c
> @@ -1345,7 +1345,7 @@ _base_build_sg_scmd_ieee(struct MPT3SAS_ADAPTER *ioc,
>  
>       sg_scmd = scsi_sglist(scmd);
>       sges_left = scsi_dma_map(scmd);
> -     if (!sges_left) {
> +     if (!sges_left < 0) {
>               sdev_printk(KERN_ERR, scmd->device,
>                       "pci_map_sg failed: request for %d bytes!\n",
>                       scsi_bufflen(scmd));
> @@ -1414,7 +1414,7 @@ _base_build_sg_scmd_ieee(struct MPT3SAS_ADAPTER *ioc,
>   fill_in_last_segment:
>  
>       /* fill the last segment */
> -     while (sges_left) {
> +     while (sges_left > 0) {
>               if (sges_left == 1)
>                       _base_add_sg_single_ieee(sg_local,
>                           simple_sgl_flags_last, 0, sg_dma_len(sg_scmd),
> -- 
> 2.0.2
> 
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Reviewed-by: Johannes Thumshirn <jthumsh...@suse.de>

-- 
Johannes Thumshirn                                       Storage
jthumsh...@suse.de                             +49 911 74053 689
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: F. Imendörffer, J. Smithard, J. Guild, D. Upmanyu, G. Norton
HRB 21284 (AG Nürnberg)
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