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[SCSI] Legacy MegaRAID: Fix READ CAPACITY 

Some Legacy megaraid cards can't actually cope with the scatter/gather
version of the READ CAPACITY command (which is what we now send them
since altering all SCSI internal I/O to go via the block layer).  Fix
this (and a few other broken megaraid driver assumptions) by sending
the non-sg version of the command if the sg list only has a single
element.

Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
This commit is contained in:
James Bottomley 2005-10-01 09:38:05 -05:00 committed by James Bottomley
parent 97af50f60f
commit 51c928c34f
1 changed files with 49 additions and 19 deletions
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64
drivers/scsi/megaraid.c
View File

@ -621,8 +621,6 @@ mega_build_cmd(adapter_t *adapter, Scsi_Cmnd *cmd, int *busy)
if(islogical) {
switch (cmd->cmnd[0]) {
case TEST_UNIT_READY:
memset(cmd->request_buffer, 0, cmd->request_bufflen);
#if MEGA_HAVE_CLUSTERING
/*
* Do we support clustering and is the support enabled
@ -652,11 +650,28 @@ mega_build_cmd(adapter_t *adapter, Scsi_Cmnd *cmd, int *busy)
return NULL;
#endif
case MODE_SENSE:
case MODE_SENSE: {
char *buf;
if (cmd->use_sg) {
struct scatterlist *sg;
sg = (struct scatterlist *)cmd->request_buffer;
buf = kmap_atomic(sg->page, KM_IRQ0) +
sg->offset;
} else
buf = cmd->request_buffer;
memset(cmd->request_buffer, 0, cmd->cmnd[4]);
if (cmd->use_sg) {
struct scatterlist *sg;
sg = (struct scatterlist *)cmd->request_buffer;
kunmap_atomic(buf - sg->offset, KM_IRQ0);
}
cmd->result = (DID_OK << 16);
cmd->scsi_done(cmd);
return NULL;
}
case READ_CAPACITY:
case INQUIRY:
@ -1685,14 +1700,23 @@ mega_rundoneq (adapter_t *adapter)
static void
mega_free_scb(adapter_t *adapter, scb_t *scb)
{
unsigned long length;
switch( scb->dma_type ) {
case MEGA_DMA_TYPE_NONE:
break;
case MEGA_BULK_DATA:
if (scb->cmd->use_sg == 0)
length = scb->cmd->request_bufflen;
else {
struct scatterlist *sgl =
(struct scatterlist *)scb->cmd->request_buffer;
length = sgl->length;
}
pci_unmap_page(adapter->dev, scb->dma_h_bulkdata,
scb->cmd->request_bufflen, scb->dma_direction);
length, scb->dma_direction);
break;
case MEGA_SGLIST:
@ -1741,6 +1765,7 @@ mega_build_sglist(adapter_t *adapter, scb_t *scb, u32 *buf, u32 *len)
struct scatterlist *sgl;
struct page *page;
unsigned long offset;
unsigned int length;
Scsi_Cmnd *cmd;
int sgcnt;
int idx;
@ -1748,14 +1773,23 @@ mega_build_sglist(adapter_t *adapter, scb_t *scb, u32 *buf, u32 *len)
cmd = scb->cmd;
/* Scatter-gather not used */
if( !cmd->use_sg ) {
if( cmd->use_sg == 0 || (cmd->use_sg == 1 &&
!adapter->has_64bit_addr)) {
if (cmd->use_sg == 0) {
page = virt_to_page(cmd->request_buffer);
offset = offset_in_page(cmd->request_buffer);
length = cmd->request_bufflen;
} else {
sgl = (struct scatterlist *)cmd->request_buffer;
page = sgl->page;
offset = sgl->offset;
length = sgl->length;
}
scb->dma_h_bulkdata = pci_map_page(adapter->dev,
page, offset,
cmd->request_bufflen,
length,
scb->dma_direction);
scb->dma_type = MEGA_BULK_DATA;
@ -1765,14 +1799,14 @@ mega_build_sglist(adapter_t *adapter, scb_t *scb, u32 *buf, u32 *len)
*/
if( adapter->has_64bit_addr ) {
scb->sgl64[0].address = scb->dma_h_bulkdata;
scb->sgl64[0].length = cmd->request_bufflen;
scb->sgl64[0].length = length;
*buf = (u32)scb->sgl_dma_addr;
*len = (u32)cmd->request_bufflen;
*len = (u32)length;
return 1;
}
else {
*buf = (u32)scb->dma_h_bulkdata;
*len = (u32)cmd->request_bufflen;
*len = (u32)length;
}
return 0;
}
@ -1791,27 +1825,23 @@ mega_build_sglist(adapter_t *adapter, scb_t *scb, u32 *buf, u32 *len)
if( sgcnt > adapter->sglen ) BUG();
*len = 0;
for( idx = 0; idx < sgcnt; idx++, sgl++ ) {
if( adapter->has_64bit_addr ) {
scb->sgl64[idx].address = sg_dma_address(sgl);
scb->sgl64[idx].length = sg_dma_len(sgl);
*len += scb->sgl64[idx].length = sg_dma_len(sgl);
}
else {
scb->sgl[idx].address = sg_dma_address(sgl);
scb->sgl[idx].length = sg_dma_len(sgl);
*len += scb->sgl[idx].length = sg_dma_len(sgl);
}
}
/* Reset pointer and length fields */
*buf = scb->sgl_dma_addr;
/*
* For passthru command, dataxferlen must be set, even for commands
* with a sg list
*/
*len = (u32)cmd->request_bufflen;
/* Return count of SG requests */
return sgcnt;
}