Re: [PATCH] ACHI: Attempt to enable a single MSI if block enable fails

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On Mon, Feb 03, 2014 at 03:46:08PM -0500, Tejun Heo wrote:
> cc'ing Alexander.  Alexander, can you please reply with Reviewed-by?

[...]

> > 
> > - --- 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;

Single MSI should not be tried in case pci_enable_msi_block() returned a
negative errno. The correct fix is below. Bjorn already has pulled it to
his pci.git tree, into pci/msi branch.

@Bjorn, 

Mind pushing the branch to the remote?

Thanks!

diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
index 8516f4d..df24eef4 100644
--- a/drivers/ata/ahci.c
+++ b/drivers/ata/ahci.c
@@ -1117,8 +1117,10 @@ int ahci_init_interrupts(struct pci_dev *pdev, unsigned int n_ports,
 
 	nvec = rc;
 	rc = pci_enable_msi_block(pdev, nvec);
-	if (rc)
+	if (rc < 0)
 		goto intx;
+	else if (rc > 0)
+		goto single_msi;
 
 	return nvec;
 
-- 
1.7.7.6

-- 
Regards,
Alexander Gordeev
agordeev@xxxxxxxxxx
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