Re: Reading EeePC900 battery info causes stalls

[Alexey Starikovskiy <astarikovskiy@suse.de>]

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Sitsofe Wheeler wrote:
> Alexey Starikovskiy wrote:
>> Could you cat /proc/interrupts ?
> 
>            CPU0
>   0:     106942   IO-APIC-edge      timer
>   1:        426   IO-APIC-edge      i8042
>   8:         41   IO-APIC-edge      rtc0
>   9:      27346   IO-APIC-fasteoi   acpi
>  12:       6840   IO-APIC-edge      i8042
>  14:          0   IO-APIC-edge      ata_piix
>  15:        203   IO-APIC-edge      ata_piix
>  16:      92357   IO-APIC-fasteoi   uhci_hcd:usb5, HDA Intel, 
> i915@pci:0000:00:02.0
>  18:      38195   IO-APIC-fasteoi   ath, uhci_hcd:usb4
>  19:          0   IO-APIC-fasteoi   uhci_hcd:usb3
>  23:      25150   IO-APIC-fasteoi   ehci_hcd:usb1, uhci_hcd:usb2
> NMI:          0   Non-maskable interrupts
> LOC:     142112   Local timer interrupts
> TRM:          0   Thermal event interrupts
> SPU:          0   Spurious interrupts
> ERR:          0
> MIS:          0
Could you please try following patch on top?

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ACPI: EC: disable GPE during QUERY handling too.

From: Alexey Starikovskiy <astarikovskiy@suse.de>


---

 drivers/acpi/ec.c |   14 +++++++++++---
 1 files changed, 11 insertions(+), 3 deletions(-)


diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
index 8d6b7e9..e027077 100644
--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -226,9 +226,16 @@ static void acpi_ec_gpe_query(void *ec_cxt);
 static int ec_check_sci(struct acpi_ec *ec, u8 state)
 {
 	if (state & ACPI_EC_FLAG_SCI) {
-		if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags))
+		if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) {
+			/* disable GPE until next transaction */
+			if (in_interrupt() &&
+			    test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) {
+				clear_bit(EC_FLAGS_GPE_MODE, &ec->flags);
+				acpi_disable_gpe(NULL, ec->gpe, ACPI_ISR);
+			}
 			return acpi_os_execute(OSL_EC_BURST_HANDLER,
 				acpi_ec_gpe_query, ec);
+		}
 	}
 	return 0;
 }
@@ -281,8 +288,9 @@ static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, u8 command,
 	if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) {
 		/* check if we received SCI during transaction */
 		ec_check_sci(ec, acpi_ec_read_status(ec));
-		/* it is safe to enable GPE outside of transaction */
-		acpi_enable_gpe(NULL, ec->gpe, ACPI_NOT_ISR);
+		/* we expect query, enable GPE back */
+		if (!test_bit(EC_FLAGS_QUERY_PENDING, &ec->flags))
+			acpi_enable_gpe(NULL, ec->gpe, ACPI_NOT_ISR);
 	} else if (test_bit(EC_FLAGS_GPE_MODE, &ec->flags) &&
 		   ec->irq_count > ACPI_EC_STORM_THRESHOLD) {
 		pr_debug(PREFIX "GPE storm detected\n");