| Date | Tue, 15 Feb 2011 16:13:13 -0800 | From | Greg KH <> | Subject | [136/272] rapidio: fix hang on RapidIO doorbell queue full condition |
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2.6.37-stable review patch. If anyone has any objections, please let us know.
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From: Thomas Taranowski <tom@baringforge.com>
commit 12a4dc43911785f51a596f771ae0701b18d436f1 upstream.
In fsl_rio_dbell_handler() the code currently simply acknowledges the QFI queue full interrupt, but does nothing to resolve the queue full condition. Instead, it jumps to the end of the isr. When a queue full condition occurs, the isr is then re-entered immediately and continually, forever.
The fix is to just fall through and read out current doorbell entries.
Signed-off-by: Thomas Taranowski <tom@baringforge.com> Cc: Alexandre Bounine <alexandre.bounine@idt.com> Cc: Kumar Gala <galak@kernel.crashing.org> Cc: Matt Porter <mporter@kernel.crashing.org> Cc: Li Yang <leoli@freescale.com> Cc: Thomas Moll <thomas.moll@sysgo.com> Cc: Micha Nelissen <micha@neli.hopto.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Grant Likely <grant.likely@secretlab.ca> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
--- arch/powerpc/sysdev/fsl_rio.c | 1 - 1 file changed, 1 deletion(-)
--- a/arch/powerpc/sysdev/fsl_rio.c +++ b/arch/powerpc/sysdev/fsl_rio.c @@ -973,7 +973,6 @@ fsl_rio_dbell_handler(int irq, void *dev if (dsr & DOORBELL_DSR_QFI) { pr_info("RIO: doorbell queue full\n"); out_be32(&priv->msg_regs->dsr, DOORBELL_DSR_QFI); - goto out; } /* XXX Need to check/dispatch until queue empty */
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