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