From: Thomas Taranowski <[email protected]> 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 <[email protected]> Cc: Alexandre Bounine <[email protected]> Cc: Kumar Gala <[email protected]> Cc: Matt Porter <[email protected]> Cc: Li Yang <[email protected]> Cc: Thomas Moll <[email protected]> Cc: Micha Nelissen <[email protected]> Cc: Benjamin Herrenschmidt <[email protected]> Cc: Grant Likely <[email protected]> Cc: <[email protected]> Signed-off-by: Andrew Morton <[email protected]> --- arch/powerpc/sysdev/fsl_rio.c | 1 - 1 file changed, 1 deletion(-) diff -puN arch/powerpc/sysdev/fsl_rio.c~rapidio-fix-hang-on-rapidio-doorbell-queue-full-condition arch/powerpc/sysdev/fsl_rio.c --- a/arch/powerpc/sysdev/fsl_rio.c~rapidio-fix-hang-on-rapidio-doorbell-queue-full-condition +++ a/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 */ _ _______________________________________________ stable mailing list [email protected] http://linux.kernel.org/mailman/listinfo/stable
