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authorLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-17 09:08:13 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-17 09:08:13 -0700
commitb6257a9036f06878a0f02354d5a07f155e1cfee0 (patch)
treec0e12e3568199b748ebc7c1f9cf4005ae5da5f36 /drivers
parentc548f08a4f7b89b93c805e0c4024b8302afa7121 (diff)
parentf5c0dde4c66421a3a2d7d6fa604a712c9b0744e5 (diff)
Merge branch 'for-linus' of git://git.kernel.dk/data/git/linux-2.6-block
* 'for-linus' of git://git.kernel.dk/data/git/linux-2.6-block: [SCSI] Remove full sg table memset() [SCSI] ide-scsi: remove usage of sg_last() Fix loop terminating conditions in fill_sg(). [BLOCK] Clear sg entry before filling in blk_rq_map_sg() IA64: iommu uses sg_next with an invalid sg element cciss: disable DMA refetch on Smart Array P600 swiotlb: fix map_sg failure handling SPARC64: fix iommu sg chaining [SCSI] ide-scsi: use scsi_sg_count() instead of ->use_sg
Diffstat (limited to 'drivers')
-rw-r--r--drivers/block/cciss.c11
-rw-r--r--drivers/scsi/ide-scsi.c8
-rw-r--r--drivers/scsi/scsi_lib.c2
3 files changed, 12 insertions, 9 deletions
diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c
index ca56a0e5cd5e..7c2cfde08f18 100644
--- a/drivers/block/cciss.c
+++ b/drivers/block/cciss.c
@@ -3076,15 +3076,20 @@ static int cciss_pci_init(ctlr_info_t *c, struct pci_dev *pdev)
}
#endif
- /* Disabling DMA prefetch for the P600
- * An ASIC bug may result in a prefetch beyond
- * physical memory.
+ /* Disabling DMA prefetch and refetch for the P600.
+ * An ASIC bug may result in accesses to invalid memory addresses.
+ * We've disabled prefetch for some time now. Testing with XEN
+ * kernels revealed a bug in the refetch if dom0 resides on a P600.
*/
if(board_id == 0x3225103C) {
__u32 dma_prefetch;
+ __u32 dma_refetch;
dma_prefetch = readl(c->vaddr + I2O_DMA1_CFG);
dma_prefetch |= 0x8000;
writel(dma_prefetch, c->vaddr + I2O_DMA1_CFG);
+ pci_read_config_dword(pdev, PCI_COMMAND_PARITY, &dma_refetch);
+ dma_refetch |= 0x1;
+ pci_write_config_dword(pdev, PCI_COMMAND_PARITY, dma_refetch);
}
#ifdef CCISS_DEBUG
diff --git a/drivers/scsi/ide-scsi.c b/drivers/scsi/ide-scsi.c
index d297f64cd432..fa7ba64483fb 100644
--- a/drivers/scsi/ide-scsi.c
+++ b/drivers/scsi/ide-scsi.c
@@ -70,7 +70,7 @@ typedef struct idescsi_pc_s {
u8 *buffer; /* Data buffer */
u8 *current_position; /* Pointer into the above buffer */
struct scatterlist *sg; /* Scatter gather table */
- struct scatterlist *last_sg; /* Last sg element */
+ unsigned int sg_cnt; /* Number of entries in sg */
int b_count; /* Bytes transferred from current entry */
struct scsi_cmnd *scsi_cmd; /* SCSI command */
void (*done)(struct scsi_cmnd *); /* Scsi completion routine */
@@ -192,7 +192,7 @@ static void idescsi_input_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsigne
}
bcount -= count; pc->b_count += count;
if (pc->b_count == pc->sg->length) {
- if (pc->sg == pc->last_sg)
+ if (!--pc->sg_cnt)
break;
pc->sg = sg_next(pc->sg);
pc->b_count = 0;
@@ -229,7 +229,7 @@ static void idescsi_output_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsign
}
bcount -= count; pc->b_count += count;
if (pc->b_count == pc->sg->length) {
- if (pc->sg == pc->last_sg)
+ if (!--pc->sg_cnt)
break;
pc->sg = sg_next(pc->sg);
pc->b_count = 0;
@@ -807,7 +807,7 @@ static int idescsi_queue (struct scsi_cmnd *cmd,
memcpy (pc->c, cmd->cmnd, cmd->cmd_len);
pc->buffer = NULL;
pc->sg = scsi_sglist(cmd);
- pc->last_sg = sg_last(pc->sg, cmd->use_sg);
+ pc->sg_cnt = scsi_sg_count(cmd);
pc->b_count = 0;
pc->request_transfer = pc->buffer_size = scsi_bufflen(cmd);
pc->scsi_cmd = cmd;
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index aac8a02cbe80..0c86be71bb33 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -764,8 +764,6 @@ struct scatterlist *scsi_alloc_sgtable(struct scsi_cmnd *cmd, gfp_t gfp_mask)
if (unlikely(!sgl))
goto enomem;
- memset(sgl, 0, sizeof(*sgl) * sgp->size);
-
/*
* first loop through, set initial index and return value
*/