> -----Original Message----- > From: Nikula, Jani <jani.nikula@xxxxxxxxx> > Sent: Friday, October 11, 2024 1:28 AM > To: Lin, Shuicheng <shuicheng.lin@xxxxxxxxx>; intel-xe@xxxxxxxxxxxxxxxxxxxxx; > intel-gfx@xxxxxxxxxxxxxxxxxxxxx > Cc: Lin, Shuicheng <shuicheng.lin@xxxxxxxxx> > Subject: Re: [PATCH] drm/i915/dp: Fix memory leak in parse_lfp_panel_dtd() > > On Thu, 10 Oct 2024, Shuicheng Lin <shuicheng.lin@xxxxxxxxx> wrote: > > The function parse_lfp_panel_dtd() is called when the driver attempts > > to initialize the eDP connector, and it allocates memory, which is > > recorded in panel->vbt.lfp_vbt_mode. However, since no eDP panel is > > connected, the driver fails at intel_edp_init_dpcd() and follows the > > failure path. Unfortunately, the allocated memory is not freed in this > > case. > > > > To fix this issue, free the memory in the failure path. > > > > leak info from kmemleak: > > " > > unreferenced object 0xffff8881252f8800 (size 128): > > comm "systemd-udevd", pid 192, jiffies 4294896880 > > hex dump (first 32 bytes): > > e8 fd 00 00 00 04 18 04 a0 04 40 05 00 00 00 03 ..........@..... > > 03 03 09 03 26 03 00 00 0a 00 00 00 00 00 00 00 ....&........... > > backtrace (crc 7448f6b4): > > [<ffffffff82475c9b>] kmemleak_alloc+0x4b/0x80 > > [<ffffffff814bb50e>] __kmalloc_cache_noprof+0x2be/0x390 > > [<ffffffffa069862c>] intel_bios_init_panel+0x1c4c/0x2720 [xe] > > [<ffffffffa0699123>] intel_bios_init_panel_early+0x13/0x20 [xe] > > [<ffffffffa06fceb9>] intel_dp_init_connector+0x2f9/0x1080 [xe] > > [<ffffffffa06c370a>] intel_ddi_init+0xbba/0xf50 [xe] > > [<ffffffffa069b906>] intel_bios_for_each_encoder+0x36/0x60 [xe] > > [<ffffffffa06d7bd6>] intel_setup_outputs+0x206/0x450 [xe] > > [<ffffffffa06dad33>] intel_display_driver_probe_nogem+0x163/0x1f0 [xe] > > [<ffffffffa0680fc7>] xe_display_init_noaccel+0x27/0x70 [xe] > > [<ffffffffa05b30d6>] xe_device_probe+0x806/0x9a0 [xe] > > [<ffffffffa0612f0f>] xe_pci_probe+0x31f/0x590 [xe] > > [<ffffffff81b41718>] local_pci_probe+0x48/0xb0 > > [<ffffffff81b432c8>] pci_device_probe+0xc8/0x280 > > [<ffffffff81d5dde8>] really_probe+0xf8/0x390 > > [<ffffffff81d5e11a>] __driver_probe_device+0x8a/0x170 " > > > > Signed-off-by: Shuicheng Lin <shuicheng.lin@xxxxxxxxx> > > Cc: Jani Nikula <jani.nikula@xxxxxxxxx> > > For future reference, the commit message and subject should indicate this is v2, > and what the changes were. See submitting-patches.rst. > > No need to resend for this. Thanks Jani for your guidance. I will follow the rules for my new patches. > > BR, > Jani. > > > > --- > > drivers/gpu/drm/i915/display/intel_dp.c | 1 + > > 1 file changed, 1 insertion(+) > > > > diff --git a/drivers/gpu/drm/i915/display/intel_dp.c > > b/drivers/gpu/drm/i915/display/intel_dp.c > > index 90fa73575feb..7141e3ca0d83 100644 > > --- a/drivers/gpu/drm/i915/display/intel_dp.c > > +++ b/drivers/gpu/drm/i915/display/intel_dp.c > > @@ -6801,6 +6801,7 @@ static bool intel_edp_init_connector(struct > > intel_dp *intel_dp, > > > > out_vdd_off: > > intel_pps_vdd_off_sync(intel_dp); > > + intel_bios_fini_panel(&intel_connector->panel); > > > > return false; > > } > > -- > Jani Nikula, Intel
