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Re: [Xen-devel] [PATCH] x86/MSI: fix error handling



On 25/03/15 16:23, Jan Beulich wrote:
__setup_msi_irq() needs to undo what it did before calling
write_msi_msg() in case that returned an error.

map_domain_pirq() needs to get rid of the MSI descriptor it
(implicitly) allocated. The case of a setup_msi_irq() failure on a
non-initial multi-vector-MSI interrupt needs special handling: While
the initial IRQ will get freed by the caller (who also passed it to
us), we need to undo the effect setup_msi_irq() had on it. (As a
benefit from the added call to msi_free_irq() we no longer need to
explicitly call destroy_irq() on the non-initial slots.)

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>

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