linux-kernel - BUG: Commit 1b7fc5aae8867046f8d3d45808309d5b7f2e036a makes special keys on my T21 unusable after resume

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Message-ID: <20080929221628.GA3082@localdomain>
Date:	Tue, 30 Sep 2008 00:16:28 +0200
From:	Karol Lewandowski <lmctlx@...il.com>
To:	Alexey Starikovskiy <astarikovskiy@...e.de>
Cc:	Len Brown <len.brown@...el.com>, "Rafael J. Wysocki" <rjw@...k.pl>,
	linux-kernel@...r.kernel.org
Subject: BUG: Commit 1b7fc5aae8867046f8d3d45808309d5b7f2e036a makes special keys on my T21 unusable after resume

Commit 1b7fc5aae8867046f8d3d45808309d5b7f2e036a causes my Thinkpad T21
to no longer generate any hotkey events (e.g. suspend fn-f4, switch-output
fn-f7, etc.) after resume.

It's regression from 2.6.25.  2.6.26 and 2.6.27-rc7 are broken,
reverting that commit on 2.6.27-rc7 makes keys work again.

Thanks.

[Rafael added for regression tracking ;]


commit 1b7fc5aae8867046f8d3d45808309d5b7f2e036a
Author: Alexey Starikovskiy <astarikovskiy@...e.de>
Date:   Fri Jun 6 11:49:33 2008 -0400

    ACPI: EC: Use msleep instead of udelay while waiting for event.
    
    http://bugzilla.kernel.org/show_bug.cgi?id=10724
    
    Signed-off-by: Alexey Starikovskiy <astarikovskiy@...e.de>
    Signed-off-by: Len Brown <len.brown@...el.com>

diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
index 0924992..5622aee 100644
--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -194,7 +194,7 @@ static int acpi_ec_wait(struct acpi_ec *ec, enum ec_event event, int force_poll)
 		while (time_before(jiffies, delay)) {
 			if (acpi_ec_check_status(ec, event))
 				return 0;
-			udelay(ACPI_EC_UDELAY);
+			msleep(1);
 		}
 	}
 	pr_err(PREFIX "acpi_ec_wait timeout, status = 0x%2.2x, event = %s\n",


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