[SCSI] aacraid: SCSI dma mapping failure case handling

This patch handles SCSI dma mapping failure case. Reporting error code to the
upper layer instead of BUG_ON().

Signed-off-by: Mahesh Rajashekhara <Mahesh_Rajashekhara@pmc-sierra.com>
Reviewed-by: Tomas Henzl <thenzl@redhat.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

2 files changed, 65 insertions, 24 deletions

diff --git a/drivers/scsi/aacraid/aachba.c b/drivers/scsi/aacraid/aachba.c
index d79457ac8bef..681434e2dfe9 100644
--- a/drivers/scsi/aacraid/aachba.c
+++ b/drivers/scsi/aacraid/aachba.c
@@ -132,11 +132,13 @@ struct inquiry_data {
  *              M O D U L E   G L O B A L S
  */
 
-static unsigned long aac_build_sg(struct scsi_cmnd* scsicmd, struct sgmap* sgmap);
-static unsigned long aac_build_sg64(struct scsi_cmnd* scsicmd, struct sgmap64* psg);
-static unsigned long aac_build_sgraw(struct scsi_cmnd* scsicmd, struct sgmapraw* psg);
-static unsigned long aac_build_sgraw2(struct scsi_cmnd *scsicmd, struct aac_raw_io2 *rio2, int sg_max);
-static int aac_convert_sgraw2(struct aac_raw_io2 *rio2, int pages, int nseg, int nseg_new);
+static long aac_build_sg(struct scsi_cmnd *scsicmd, struct sgmap *sgmap);
+static long aac_build_sg64(struct scsi_cmnd *scsicmd, struct sgmap64 *psg);
+static long aac_build_sgraw(struct scsi_cmnd *scsicmd, struct sgmapraw *psg);
+static long aac_build_sgraw2(struct scsi_cmnd *scsicmd,
+                                struct aac_raw_io2 *rio2, int sg_max);
+static int aac_convert_sgraw2(struct aac_raw_io2 *rio2,
+                                int pages, int nseg, int nseg_new);
 static int aac_send_srb_fib(struct scsi_cmnd* scsicmd);
 #ifdef AAC_DETAILED_STATUS_INFO
 static char *aac_get_status_string(u32 status);
@@ -971,6 +973,7 @@ 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;
+        long ret;
 
         aac_fib_init(fib);
         if (dev->comm_interface == AAC_COMM_MESSAGE_TYPE2 && !dev->sync_mode) {
@@ -982,7 +985,10 @@ 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;
                 command = ContainerRawIo2;
                 fibsize = sizeof(struct aac_raw_io2) +
                         ((le32_to_cpu(readcmd2->sgeCnt)-1) * sizeof(struct sge_ieee1212));
@@ -996,7 +1002,9 @@ 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 +1027,8 @@ static int aac_read_block64(struct fib * fib, struct scsi_cmnd * cmd, u64 lba, u
 {
         u16 fibsize;
         struct aac_read64 *readcmd;
+        long ret;
+
         aac_fib_init(fib);
         readcmd = (struct aac_read64 *) fib_data(fib);
         readcmd->command = cpu_to_le32(VM_CtHostRead64);
@@ -1028,7 +1038,9 @@ 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 +1062,8 @@ static int aac_read_block(struct fib * fib, struct scsi_cmnd * cmd, u64 lba, u32
 {
         u16 fibsize;
         struct aac_read *readcmd;
+        long ret;
+
         aac_fib_init(fib);
         readcmd = (struct aac_read *) fib_data(fib);
         readcmd->command = cpu_to_le32(VM_CtBlockRead);
@@ -1057,7 +1071,9 @@ 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 +1095,7 @@ 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;
+        long ret;
 
         aac_fib_init(fib);
         if (dev->comm_interface == AAC_COMM_MESSAGE_TYPE2 && !dev->sync_mode) {
@@ -1093,7 +1110,10 @@ 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 +1130,9 @@ 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 +1155,8 @@ static int aac_write_block64(struct fib * fib, struct scsi_cmnd * cmd, u64 lba,
 {
         u16 fibsize;
         struct aac_write64 *writecmd;
+        long ret;
+
         aac_fib_init(fib);
         writecmd = (struct aac_write64 *) fib_data(fib);
         writecmd->command = cpu_to_le32(VM_CtHostWrite64);
@@ -1142,7 +1166,9 @@ 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 +1190,8 @@ static int aac_write_block(struct fib * fib, struct scsi_cmnd * cmd, u64 lba, u3
 {
         u16 fibsize;
         struct aac_write *writecmd;
+        long ret;
+
         aac_fib_init(fib);
         writecmd = (struct aac_write *) fib_data(fib);
         writecmd->command = cpu_to_le32(VM_CtBlockWrite);
@@ -1173,7 +1201,9 @@ 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 +1265,11 @@ static int aac_scsi_64(struct fib * fib, struct scsi_cmnd * cmd)
 {
         u16 fibsize;
         struct aac_srb * srbcmd = aac_scsi_common(fib, cmd);
+        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 +1296,11 @@ static int aac_scsi_32(struct fib * fib, struct scsi_cmnd * cmd)
 {
         u16 fibsize;
         struct aac_srb * srbcmd = aac_scsi_common(fib, cmd);
+        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));
@@ -2870,7 +2906,7 @@ static int aac_send_srb_fib(struct scsi_cmnd* scsicmd)
         return -1;
 }
 
-static unsigned long aac_build_sg(struct scsi_cmnd* scsicmd, struct sgmap* psg)
+static long aac_build_sg(struct scsi_cmnd *scsicmd, struct sgmap *psg)
 {
         struct aac_dev *dev;
         unsigned long byte_count = 0;
@@ -2883,7 +2919,8 @@ 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;
@@ -2912,7 +2949,7 @@ static unsigned long aac_build_sg(struct scsi_cmnd* scsicmd, struct sgmap* psg)
 }
 
 
-static unsigned long aac_build_sg64(struct scsi_cmnd* scsicmd, struct sgmap64* psg)
+static long aac_build_sg64(struct scsi_cmnd *scsicmd, struct sgmap64 *psg)
 {
         struct aac_dev *dev;
         unsigned long byte_count = 0;
@@ -2927,7 +2964,8 @@ 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;
@@ -2957,7 +2995,7 @@ static unsigned long aac_build_sg64(struct scsi_cmnd* scsicmd, struct sgmap64* p
         return byte_count;
 }
 
-static unsigned long aac_build_sgraw(struct scsi_cmnd* scsicmd, struct sgmapraw* psg)
+static long aac_build_sgraw(struct scsi_cmnd *scsicmd, struct sgmapraw *psg)
 {
         unsigned long byte_count = 0;
         int nseg;
@@ -2972,7 +3010,8 @@ 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;
@@ -3005,13 +3044,15 @@ static unsigned long aac_build_sgraw(struct scsi_cmnd* scsicmd, struct sgmapraw*
         return byte_count;
 }
 
-static unsigned long aac_build_sgraw2(struct scsi_cmnd *scsicmd, struct aac_raw_io2 *rio2, int sg_max)
+static long aac_build_sgraw2(struct scsi_cmnd *scsicmd,
+                                struct aac_raw_io2 *rio2, int sg_max)
 {
         unsigned long byte_count = 0;
         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 9e933a88a8bc..742f5d7eb0f5 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