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Hash: SHA1
From: Michael Marley <michael@xxxxxxxxxxxxxxxxx>
Commit 7b92b4f61ec49cb1a5813298f35258bd7ecd3667 ("PCI/MSI: Remove
pci_enable_msi_block_auto()") causes the AHCI driver to immediately
switch to INTx mode if the pci_enable_msi_block() call fails to
allocate the requested number of MSIs. This behavior causes some
systems (for example, the Lenovo ThinkCentre m57p) to begin using
INTx when they worked fine in single MSI mode before. This patch
makes the driver try to enable a single MSI if the
pci_enable_msi_block() call fails instead of switching directly
to INTx.
Signed-off-by: Michael Marley <michael@xxxxxxxxxxxxxxxxx>
- ---
- --- drivers/ata/ahci.c.orig 2014-02-03 20:00:04.834008843 +0000
+++ drivers/ata/ahci.c 2014-02-03 19:34:53.737257483 +0000
@@ -1171,7 +1171,7 @@ static int ahci_init_interrupts(struct p
nvec = rc;
rc = pci_enable_msi_block(pdev, nvec);
if (rc)
- - goto intx;
+ goto single_msi;
return nvec;
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