Bug in arch/powerpc/sysdev/fsl_gtm.c

2 messages, 2 authors, 2011-03-15 · open the first message on its own page

Bug in arch/powerpc/sysdev/fsl_gtm.c

From: Jean-Denis Boyer <hidden>
Date: 2011-02-16 15:11:27

Hi.
There is a bug in the function gtm_set_ref_timer16.
When called, it correctly sets the requested timer,
but the other timer that shares the register GTCFR is reset.

The parameter 'clear' passed to macro clrsetbits_8 should not be
a bitwise complement, since the macro already complements it.

Here is a patch that should fix this issue.
--- linux-2.6.35.11/arch/powerpc/sysdev/fsl_gtm.c
+++ linux/arch/powerpc/sysdev/fsl_gtm.c
@@ -203,13 +203,10 @@
 	spin_lock_irqsave(&gtm->lock, flags);
 
 	/*
-	 * Properly reset timers: stop, reset, set up prescalers, reference
+	 * Properly set timers: stop, set up prescalers, reference
 	 * value and clear event register.
 	 */
-	clrsetbits_8(tmr->gtcfr, ~(GTCFR_STP(num) | GTCFR_RST(num)),
-				 GTCFR_STP(num) | GTCFR_RST(num));
-
-	setbits8(tmr->gtcfr, GTCFR_STP(num));
+	setbits8(tmr->gtcfr, GTCFR_STP(num) | GTCFR_RST(num));
 
 	if (tmr->gtpsr)
 		out_be16(tmr->gtpsr, psr);
Regards,

Jean-Denis Boyer, Eng.
Media5 Corporation - Mediatrix, M5T, Media5Boss
4229 Garlock Street, Sherbrooke (Québec), J1L 2C8, CANADA
(819)829-8749 x5241

Re: Bug in arch/powerpc/sysdev/fsl_gtm.c

From: Kumar Gala <hidden>
Date: 2011-03-15 15:53:51

On Feb 16, 2011, at 8:59 AM, Jean-Denis Boyer wrote:
quoted hunk
Hi.
There is a bug in the function gtm_set_ref_timer16.
When called, it correctly sets the requested timer,
but the other timer that shares the register GTCFR is reset.

The parameter 'clear' passed to macro clrsetbits_8 should not be
a bitwise complement, since the macro already complements it.

Here is a patch that should fix this issue.
--- linux-2.6.35.11/arch/powerpc/sysdev/fsl_gtm.c
+++ linux/arch/powerpc/sysdev/fsl_gtm.c
@@ -203,13 +203,10 @@
	spin_lock_irqsave(&gtm->lock, flags);

	/*
-	 * Properly reset timers: stop, reset, set up prescalers, reference
+	 * Properly set timers: stop, set up prescalers, reference
	 * value and clear event register.
	 */
-	clrsetbits_8(tmr->gtcfr, ~(GTCFR_STP(num) | GTCFR_RST(num)),
-				 GTCFR_STP(num) | GTCFR_RST(num));
-
-	setbits8(tmr->gtcfr, GTCFR_STP(num));
+	setbits8(tmr->gtcfr, GTCFR_STP(num) | GTCFR_RST(num));

	if (tmr->gtpsr)
		out_be16(tmr->gtpsr, psr);
If you'd like this applied please re-send w/proper signed-off-by

- k
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