[SCSI] qla2xxx: Check for empty slot in request queue before posting Command type 6 request.
For ISP82xx, the check for empty slot in request queue before posting command type 6 request was missing. This could lead to request queue entry corruptions causing IO timeouts. Signed-off-by: Giridhar Malavali <giridhar.malavali@qlogic.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
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@ -2672,6 +2672,19 @@ qla82xx_start_scsi(srb_t *sp)
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sufficient_dsds:
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req_cnt = 1;
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if (req->cnt < (req_cnt + 2)) {
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cnt = (uint16_t)RD_REG_DWORD_RELAXED(
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®->req_q_out[0]);
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if (req->ring_index < cnt)
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req->cnt = cnt - req->ring_index;
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else
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req->cnt = req->length -
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(req->ring_index - cnt);
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}
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if (req->cnt < (req_cnt + 2))
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goto queuing_error;
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ctx = sp->ctx = mempool_alloc(ha->ctx_mempool, GFP_ATOMIC);
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if (!sp->ctx) {
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DEBUG(printk(KERN_INFO
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