From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:43810 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754162AbdLDOCJ (ORCPT ); Mon, 4 Dec 2017 09:02:09 -0500 Subject: Patch "drm/i915: Don't try indexed reads to alternate slave addresses" has been added to the 4.4-stable tree To: ville.syrjala@linux.intel.com, chris@chris-wilson.co.uk, daniel.vetter@ffwll.ch, djkurtz@chromium.org, gregkh@linuxfoundation.org, joonas.lahtinen@linux.intel.com, seanpaul@chromium.org Cc: , From: Date: Mon, 04 Dec 2017 15:02:16 +0100 Message-ID: <1512396136231148@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org List-ID: This is a note to let you know that I've just added the patch titled drm/i915: Don't try indexed reads to alternate slave addresses to the 4.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: drm-i915-don-t-try-indexed-reads-to-alternate-slave-addresses.patch and it can be found in the queue-4.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. >>From ae5c631e605a452a5a0e73205a92810c01ed954b Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Ville=20Syrj=C3=A4l=C3=A4?= Date: Thu, 23 Nov 2017 21:41:56 +0200 Subject: drm/i915: Don't try indexed reads to alternate slave addresses MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Ville Syrjälä commit ae5c631e605a452a5a0e73205a92810c01ed954b upstream. We can only specify the one slave address to indexed reads/writes. Make sure the messages we check are destined to the same slave address before deciding to do an indexed transfer. Cc: Daniel Kurtz Cc: Chris Wilson Cc: Daniel Vetter Cc: Sean Paul Fixes: 56f9eac05489 ("drm/i915/intel_i2c: use INDEX cycles for i2c read transactions") Signed-off-by: Ville Syrjälä Link: https://patchwork.freedesktop.org/patch/msgid/20171123194157.25367-2-ville.syrjala@linux.intel.com Reviewed-by: Chris Wilson (cherry picked from commit c4deb62d7821672265b87952bcd1c808f3bf3e8f) Signed-off-by: Joonas Lahtinen Signed-off-by: Greg Kroah-Hartman --- drivers/gpu/drm/i915/intel_i2c.c | 1 + 1 file changed, 1 insertion(+) --- a/drivers/gpu/drm/i915/intel_i2c.c +++ b/drivers/gpu/drm/i915/intel_i2c.c @@ -440,6 +440,7 @@ static bool gmbus_is_index_read(struct i2c_msg *msgs, int i, int num) { return (i + 1 < num && + msgs[i].addr == msgs[i + 1].addr && !(msgs[i].flags & I2C_M_RD) && msgs[i].len <= 2 && (msgs[i + 1].flags & I2C_M_RD)); } Patches currently in stable-queue which might be from ville.syrjala@linux.intel.com are queue-4.4/drm-i915-prevent-zero-length-index-write.patch queue-4.4/drm-i915-don-t-try-indexed-reads-to-alternate-slave-addresses.patch