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FAILED: patch "[PATCH] ACPICA: Store GPE register enable masks upfront" failed to apply to 3.19-stable tree

PATCH [email protected] 1 participant 1 message May 2, 2015

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Stable branch ACPI ACPI component architecture (acpica)
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The patch below does not apply to the 3.19-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

Quoted 1 line

From 0ee0d34985ceffe4036319e1e46df8bff591b9e3 Mon Sep 17 00:00:00 2001

From: "Rafael J. Wysocki" <[email protected]>
Date: Wed, 15 Apr 2015 04:00:27 +0200
Subject: [PATCH] ACPICA: Store GPE register enable masks upfront

It is reported that ACPI interrupts do not work any more on Dell Latitude D600 after commit c50f13c672df (ACPICA: Save current masks of enabled GPEs after enable register writes). The problem turns out to be related to the fact that the enable_mask and enable_for_run GPE bit masks are not in sync (in the absence of any system suspend/resume events) for at least one GPE register on that machine.

Address this problem by writing the enable_for_run mask into enable_mask as soon as enable_for_run is updated instead of doing that only after the subsequent register write has succeeded. For consistency, update acpi_hw_gpe_enable_write() to store the bit mask to be written into the GPE register in enable_mask unconditionally before the write.

Since the ACPI_GPE_SAVE_MASK flag is not necessary any more after that, drop it along with the symbols depending on it.

Reported-and-tested-by Jim Bos <[email protected]>
Fixes c50f13c672df (ACPICA: Save current masks of enabled GPEs after enable register writes)
Cc 3.19+ <[email protected]> # 3.19+
Signed-off-by Rafael J. Wysocki <[email protected]>
drivers/acpi/acpica/evgpe.c +3 -2
index 5ed064e8673c..ccf793247447 100644
@@ -92,6 +92,7 @@ acpi_ev_update_gpe_enable_mask(struct acpi_gpe_event_info *gpe_event_info)
 		ACPI_SET_BIT(gpe_register_info->enable_for_run,
 			     (u8)register_bit);
 	}
+	gpe_register_info->enable_mask = gpe_register_info->enable_for_run;
 
 	return_ACPI_STATUS(AE_OK);
 }

@@ -123,7 +124,7 @@ acpi_status acpi_ev_enable_gpe(struct acpi_gpe_event_info *gpe_event_info)
 
 	/* Enable the requested GPE */
 
-	status = acpi_hw_low_set_gpe(gpe_event_info, ACPI_GPE_ENABLE_SAVE);
+	status = acpi_hw_low_set_gpe(gpe_event_info, ACPI_GPE_ENABLE);
 	return_ACPI_STATUS(status);
 }
 

@@ -202,7 +203,7 @@ acpi_ev_remove_gpe_reference(struct acpi_gpe_event_info *gpe_event_info)
 		if (ACPI_SUCCESS(status)) {
 			status =
 			    acpi_hw_low_set_gpe(gpe_event_info,
-						ACPI_GPE_DISABLE_SAVE);
+						ACPI_GPE_DISABLE);
 		}
 
 		if (ACPI_FAILURE(status)) {
drivers/acpi/acpica/hwgpe.c +4 -7
index d7be3cbff151..73cfa5947ff3 100644
@@ -89,6 +89,8 @@ u32 acpi_hw_get_gpe_register_bit(struct acpi_gpe_event_info *gpe_event_info)
  * RETURN:	Status
  *
  * DESCRIPTION: Enable or disable a single GPE in the parent enable register.
+ *              The enable_mask field of the involved GPE register must be
+ *              updated by the caller if necessary.
  *
  ******************************************************************************/
 

@@ -119,7 +121,7 @@ acpi_hw_low_set_gpe(struct acpi_gpe_event_info *gpe_event_info, u32 action)
 	/* Set or clear just the bit that corresponds to this GPE */
 
 	register_bit = acpi_hw_get_gpe_register_bit(gpe_event_info);
-	switch (action & ~ACPI_GPE_SAVE_MASK) {
+	switch (action) {
 	case ACPI_GPE_CONDITIONAL_ENABLE:
 
 		/* Only enable if the corresponding enable_mask bit is set */

@@ -149,9 +151,6 @@ acpi_hw_low_set_gpe(struct acpi_gpe_event_info *gpe_event_info, u32 action)
 	/* Write the updated enable mask */
 
 	status = acpi_hw_write(enable_mask, &gpe_register_info->enable_address);
-	if (ACPI_SUCCESS(status) && (action & ACPI_GPE_SAVE_MASK)) {
-		gpe_register_info->enable_mask = (u8)enable_mask;
-	}
 	return (status);
 }
 

@@ -297,10 +296,8 @@ acpi_hw_gpe_enable_write(u8 enable_mask,
 {
 	acpi_status status;
 
+	gpe_register_info->enable_mask = enable_mask;
 	status = acpi_hw_write(enable_mask, &gpe_register_info->enable_address);
-	if (ACPI_SUCCESS(status)) {
-		gpe_register_info->enable_mask = enable_mask;
-	}
 	return (status);
 }
include/acpi/actypes.h +0 -4
index ace520f3780e..f5ca0e989bba 100644
@@ -759,10 +759,6 @@ typedef u32 acpi_event_status;
 #define ACPI_GPE_ENABLE                 0
 #define ACPI_GPE_DISABLE                1
 #define ACPI_GPE_CONDITIONAL_ENABLE     2
-#define ACPI_GPE_SAVE_MASK              4
-
-#define ACPI_GPE_ENABLE_SAVE            (ACPI_GPE_ENABLE | ACPI_GPE_SAVE_MASK)
-#define ACPI_GPE_DISABLE_SAVE           (ACPI_GPE_DISABLE | ACPI_GPE_SAVE_MASK)
 
 /*
  * GPE info flags - Per GPE