[PATCH RFC 21/77] csiostor: Update MSI/MSI-X interrupts enablement code

[Alexander Gordeev]

As result of recent re-design of the MSI/MSI-X interrupts enabling
pattern this driver has to be updated to use the new technique to
obtain a optimal number of MSI/MSI-X interrupts required.

Signed-off-by: Alexander Gordeev <agordeev@xxxxxxxxxx>
---
 drivers/scsi/csiostor/csio_isr.c |   18 ++++++++++++------
 1 files changed, 12 insertions(+), 6 deletions(-)

diff --git a/drivers/scsi/csiostor/csio_isr.c b/drivers/scsi/csiostor/csio_isr.c
index abf20ab..b8a840e 100644
--- a/drivers/scsi/csiostor/csio_isr.c
+++ b/drivers/scsi/csiostor/csio_isr.c
@@ -512,6 +512,16 @@ csio_enable_msix(struct csio_hw *hw)
 	if (hw->flags & CSIO_HWF_USING_SOFT_PARAMS || !csio_is_hw_master(hw))
 		cnt = min_t(uint8_t, hw->cfg_niq, cnt);
 
+	rv = pci_msix_table_size(hw->pdev);
+	if (rv < 0)
+		return rv;
+
+	cnt = min(cnt, rv);
+	if (cnt < min) {
+		csio_info(hw, "Not using MSI-X, remainder:%d\n", rv);
+		return -ENOSPC;
+	}
+
 	entries = kzalloc(sizeof(struct msix_entry) * cnt, GFP_KERNEL);
 	if (!entries)
 		return -ENOMEM;
@@ -521,19 +531,15 @@ csio_enable_msix(struct csio_hw *hw)
 
 	csio_dbg(hw, "FW supp #niq:%d, trying %d msix's\n", hw->cfg_niq, cnt);
 
-	while ((rv = pci_enable_msix(hw->pdev, entries, cnt)) >= min)
-		cnt = rv;
+	rv = pci_enable_msix(hw->pdev, entries, cnt);
 	if (!rv) {
 		if (cnt < (hw->num_sqsets + extra)) {
 			csio_dbg(hw, "Reducing sqsets to %d\n", cnt - extra);
 			csio_reduce_sqsets(hw, cnt - extra);
 		}
 	} else {
-		if (rv > 0)
-			csio_info(hw, "Not using MSI-X, remainder:%d\n", rv);
-
 		kfree(entries);
-		return -ENOSPC;
+		return rv;
 	}
 
 	/* Save off vectors */
-- 
1.7.7.6

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