On 10/16/2012 10:59 PM, Mahesh Rajashekhara wrote:
> This patch handles SCSI dma mapping failure case. Reporting error code to the upper layer instead of BUG_ON().
>
> This patch is created against current upstream kernel.
>
> Signed-off-by: Mahesh Rajashekhara <Mahesh_Rajashekhara@xxxxxxxxxxxxxx>
> ---
> drivers/scsi/aacraid/aachba.c | 63 +++++++++++++++++++++++++++++++---------
> drivers/scsi/aacraid/aacraid.h | 2 +-
> 2 files changed, 50 insertions(+), 15 deletions(-)
>
> diff --git a/drivers/scsi/aacraid/aachba.c b/drivers/scsi/aacraid/aachba.c
> index d79457a..efa2900 100644
> --- a/drivers/scsi/aacraid/aachba.c
> +++ b/drivers/scsi/aacraid/aachba.c
> @@ -971,6 +971,7 @@ static int aac_read_raw_io(struct fib * fib, struct scsi_cmnd * cmd, u64 lba, u3
> {
> struct aac_dev *dev = fib->dev;
> u16 fibsize, command;
> + unsigned long ret;
>
> aac_fib_init(fib);
> if (dev->comm_interface == AAC_COMM_MESSAGE_TYPE2 && !dev->sync_mode) {
> @@ -982,7 +983,10 @@ static int aac_read_raw_io(struct fib * fib, struct scsi_cmnd * cmd, u64 lba, u3
> readcmd2->byteCount = cpu_to_le32(count<<9);
> readcmd2->cid = cpu_to_le16(scmd_id(cmd));
> readcmd2->flags = cpu_to_le16(RIO2_IO_TYPE_READ);
> - aac_build_sgraw2(cmd, readcmd2, dev->scsi_host_ptr->sg_tablesize);
> + ret = aac_build_sgraw2(cmd, readcmd2,
> + dev->scsi_host_ptr->sg_tablesize);
> + if (ret < 0)
> + return ret;
Hi Mahesh, 'ret' is 'unsigned', the above test will not work.
Tomas
> command = ContainerRawIo2;
> fibsize = sizeof(struct aac_raw_io2) +
> ((le32_to_cpu(readcmd2->sgeCnt)-1) * sizeof(struct sge_ieee1212));
> @@ -996,7 +1000,9 @@ static int aac_read_raw_io(struct fib * fib, struct scsi_cmnd * cmd, u64 lba, u3
> readcmd->flags = cpu_to_le16(RIO_TYPE_READ);
> readcmd->bpTotal = 0;
> readcmd->bpComplete = 0;
> - aac_build_sgraw(cmd, &readcmd->sg);
> + ret = aac_build_sgraw(cmd, &readcmd->sg);
> + if (ret < 0)
> + return ret;
> command = ContainerRawIo;
> fibsize = sizeof(struct aac_raw_io) +
> ((le32_to_cpu(readcmd->sg.count)-1) * sizeof(struct sgentryraw));
> @@ -1019,6 +1025,7 @@ static int aac_read_block64(struct fib * fib, struct scsi_cmnd * cmd, u64 lba, u
> {
> u16 fibsize;
> struct aac_read64 *readcmd;
> + unsigned long ret;
> aac_fib_init(fib);
> readcmd = (struct aac_read64 *) fib_data(fib);
> readcmd->command = cpu_to_le32(VM_CtHostRead64);
> @@ -1028,7 +1035,9 @@ static int aac_read_block64(struct fib * fib, struct scsi_cmnd * cmd, u64 lba, u
> readcmd->pad = 0;
> readcmd->flags = 0;
>
> - aac_build_sg64(cmd, &readcmd->sg);
> + ret = aac_build_sg64(cmd, &readcmd->sg);
> + if (ret < 0)
> + return ret;
> fibsize = sizeof(struct aac_read64) +
> ((le32_to_cpu(readcmd->sg.count) - 1) *
> sizeof (struct sgentry64));
> @@ -1050,6 +1059,8 @@ static int aac_read_block(struct fib * fib, struct scsi_cmnd * cmd, u64 lba, u32
> {
> u16 fibsize;
> struct aac_read *readcmd;
> + unsigned long ret;
> +
> aac_fib_init(fib);
> readcmd = (struct aac_read *) fib_data(fib);
> readcmd->command = cpu_to_le32(VM_CtBlockRead);
> @@ -1057,7 +1068,9 @@ static int aac_read_block(struct fib * fib, struct scsi_cmnd * cmd, u64 lba, u32
> readcmd->block = cpu_to_le32((u32)(lba&0xffffffff));
> readcmd->count = cpu_to_le32(count * 512);
>
> - aac_build_sg(cmd, &readcmd->sg);
> + ret = aac_build_sg(cmd, &readcmd->sg);
> + if (ret < 0)
> + return ret;
> fibsize = sizeof(struct aac_read) +
> ((le32_to_cpu(readcmd->sg.count) - 1) *
> sizeof (struct sgentry));
> @@ -1079,6 +1092,7 @@ static int aac_write_raw_io(struct fib * fib, struct scsi_cmnd * cmd, u64 lba, u
> {
> struct aac_dev *dev = fib->dev;
> u16 fibsize, command;
> + unsigned long ret;
>
> aac_fib_init(fib);
> if (dev->comm_interface == AAC_COMM_MESSAGE_TYPE2 && !dev->sync_mode) {
> @@ -1093,7 +1107,10 @@ static int aac_write_raw_io(struct fib * fib, struct scsi_cmnd * cmd, u64 lba, u
> (((aac_cache & 5) != 5) || !fib->dev->cache_protected)) ?
> cpu_to_le16(RIO2_IO_TYPE_WRITE|RIO2_IO_SUREWRITE) :
> cpu_to_le16(RIO2_IO_TYPE_WRITE);
> - aac_build_sgraw2(cmd, writecmd2, dev->scsi_host_ptr->sg_tablesize);
> + ret = aac_build_sgraw2(cmd, writecmd2,
> + dev->scsi_host_ptr->sg_tablesize);
> + if (ret < 0)
> + return ret;
> command = ContainerRawIo2;
> fibsize = sizeof(struct aac_raw_io2) +
> ((le32_to_cpu(writecmd2->sgeCnt)-1) * sizeof(struct sge_ieee1212));
> @@ -1110,7 +1127,9 @@ static int aac_write_raw_io(struct fib * fib, struct scsi_cmnd * cmd, u64 lba, u
> cpu_to_le16(RIO_TYPE_WRITE);
> writecmd->bpTotal = 0;
> writecmd->bpComplete = 0;
> - aac_build_sgraw(cmd, &writecmd->sg);
> + ret = aac_build_sgraw(cmd, &writecmd->sg);
> + if (ret < 0)
> + return ret;
> command = ContainerRawIo;
> fibsize = sizeof(struct aac_raw_io) +
> ((le32_to_cpu(writecmd->sg.count)-1) * sizeof (struct sgentryraw));
> @@ -1133,6 +1152,7 @@ static int aac_write_block64(struct fib * fib, struct scsi_cmnd * cmd, u64 lba,
> {
> u16 fibsize;
> struct aac_write64 *writecmd;
> + unsigned long ret;
> aac_fib_init(fib);
> writecmd = (struct aac_write64 *) fib_data(fib);
> writecmd->command = cpu_to_le32(VM_CtHostWrite64);
> @@ -1142,7 +1162,9 @@ static int aac_write_block64(struct fib * fib, struct scsi_cmnd * cmd, u64 lba,
> writecmd->pad = 0;
> writecmd->flags = 0;
>
> - aac_build_sg64(cmd, &writecmd->sg);
> + ret = aac_build_sg64(cmd, &writecmd->sg);
> + if (ret < 0)
> + return ret;
> fibsize = sizeof(struct aac_write64) +
> ((le32_to_cpu(writecmd->sg.count) - 1) *
> sizeof (struct sgentry64));
> @@ -1164,6 +1186,7 @@ static int aac_write_block(struct fib * fib, struct scsi_cmnd * cmd, u64 lba, u3
> {
> u16 fibsize;
> struct aac_write *writecmd;
> + unsigned long ret;
> aac_fib_init(fib);
> writecmd = (struct aac_write *) fib_data(fib);
> writecmd->command = cpu_to_le32(VM_CtBlockWrite);
> @@ -1173,7 +1196,9 @@ static int aac_write_block(struct fib * fib, struct scsi_cmnd * cmd, u64 lba, u3
> writecmd->sg.count = cpu_to_le32(1);
> /* ->stable is not used - it did mean which type of write */
>
> - aac_build_sg(cmd, &writecmd->sg);
> + ret = aac_build_sg(cmd, &writecmd->sg);
> + if (ret < 0)
> + return ret;
> fibsize = sizeof(struct aac_write) +
> ((le32_to_cpu(writecmd->sg.count) - 1) *
> sizeof (struct sgentry));
> @@ -1235,8 +1260,11 @@ static int aac_scsi_64(struct fib * fib, struct scsi_cmnd * cmd)
> {
> u16 fibsize;
> struct aac_srb * srbcmd = aac_scsi_common(fib, cmd);
> + unsigned long ret;
>
> - aac_build_sg64(cmd, (struct sgmap64*) &srbcmd->sg);
> + ret = aac_build_sg64(cmd, (struct sgmap64 *) &srbcmd->sg);
> + if (ret < 0)
> + return ret;
> srbcmd->count = cpu_to_le32(scsi_bufflen(cmd));
>
> memset(srbcmd->cdb, 0, sizeof(srbcmd->cdb));
> @@ -1263,8 +1291,11 @@ static int aac_scsi_32(struct fib * fib, struct scsi_cmnd * cmd)
> {
> u16 fibsize;
> struct aac_srb * srbcmd = aac_scsi_common(fib, cmd);
> + unsigned long ret;
>
> - aac_build_sg(cmd, (struct sgmap*)&srbcmd->sg);
> + ret = aac_build_sg(cmd, (struct sgmap *)&srbcmd->sg);
> + if (ret < 0)
> + return ret;
> srbcmd->count = cpu_to_le32(scsi_bufflen(cmd));
>
> memset(srbcmd->cdb, 0, sizeof(srbcmd->cdb));
> @@ -2883,7 +2914,8 @@ static unsigned long aac_build_sg(struct scsi_cmnd* scsicmd, struct sgmap* psg)
> psg->sg[0].count = 0;
>
> nseg = scsi_dma_map(scsicmd);
> - BUG_ON(nseg < 0);
> + if (nseg < 0)
> + return nseg;
> if (nseg) {
> struct scatterlist *sg;
> int i;
> @@ -2927,7 +2959,8 @@ static unsigned long aac_build_sg64(struct scsi_cmnd* scsicmd, struct sgmap64* p
> psg->sg[0].count = 0;
>
> nseg = scsi_dma_map(scsicmd);
> - BUG_ON(nseg < 0);
> + if (nseg < 0)
> + return nseg;
> if (nseg) {
> struct scatterlist *sg;
> int i;
> @@ -2972,7 +3005,8 @@ static unsigned long aac_build_sgraw(struct scsi_cmnd* scsicmd, struct sgmapraw*
> psg->sg[0].flags = 0;
>
> nseg = scsi_dma_map(scsicmd);
> - BUG_ON(nseg < 0);
> + if (nseg < 0)
> + return nseg;
> if (nseg) {
> struct scatterlist *sg;
> int i;
> @@ -3011,7 +3045,8 @@ static unsigned long aac_build_sgraw2(struct scsi_cmnd *scsicmd, struct aac_raw_
> int nseg;
>
> nseg = scsi_dma_map(scsicmd);
> - BUG_ON(nseg < 0);
> + if (nseg < 0)
> + return nseg;
> if (nseg) {
> struct scatterlist *sg;
> int i, conformable = 0;
> diff --git a/drivers/scsi/aacraid/aacraid.h b/drivers/scsi/aacraid/aacraid.h
> index 9e933a8..742f5d7 100644
> --- a/drivers/scsi/aacraid/aacraid.h
> +++ b/drivers/scsi/aacraid/aacraid.h
> @@ -12,7 +12,7 @@
> *----------------------------------------------------------------------------*/
>
> #ifndef AAC_DRIVER_BUILD
> -# define AAC_DRIVER_BUILD 29800
> +# define AAC_DRIVER_BUILD 29801
> # define AAC_DRIVER_BRANCH "-ms"
> #endif
> #define MAXIMUM_NUM_CONTAINERS 32
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