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Message-ID: <20090428015844.GA16190@hash.localnet>
Date: Mon, 27 Apr 2009 21:58:44 -0400
From: Bob Copeland <me@...copeland.com>
To: johannes@...solutions.net
Cc: linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] appletouch: fix DMA to/from stack buffer
CONFIG_DMA_API_DEBUG spotted an instance of appletouch using
an array on the stack as a DMA buffer for certain hardware.
Change it to use a kmalloc()ed buffer instead.
This fixes the following error:
[ 11.526270] uhci_hcd 0000:00:1d.0: DMA-API: device driver maps memory fromstack [addr=f1d33e2c]
[ 11.526274] Modules linked in: appletouch(+) snd_seq_dummy snd_seq_oss snd_seq_midi_event usbhid arc4 ecb snd_seq snd_seq_device ath5k snd_pcm_oss snd_mixer_oss mac80211 sky2 ohci1394 bitrev ath ieee1394 snd_pcm ehci_hcd uhci_hcd crc32 sg joydev snd_timer cfg80211 snd thermal button processor snd_page_alloc ac battery applesmc sr_mod input_polldev cdrom evdev unix
[ 11.526333] Pid: 2213, comm: modprobe Not tainted 2.6.30-rc3-wl #112
[ 11.526337] Call Trace:
[ 11.526344] [<c012590f>] warn_slowpath+0x76/0xa5
[ 11.526352] [<c0107166>] ? sched_clock+0x3f/0x64
[ 11.526360] [<c014c98c>] ? __module_text_address+0x10/0x4d
[ 11.526366] [<c014cc54>] ? is_module_text_address+0x28/0x42
[ 11.526373] [<c013569e>] ? __kernel_text_address+0x5a/0x60
[ 11.526379] [<c010554b>] ? print_context_stack+0xc9/0xde
[ 11.526387] [<c0143ce7>] ? put_lock_stats+0xd/0x21
[ 11.526393] [<c0145589>] ? trace_hardirqs_on+0xb/0xd
[ 11.526400] [<c0356336>] ? _spin_unlock_irqrestore+0x47/0x5d
[ 11.526406] [<c0218914>] check_for_stack+0x58/0x7a
[ 11.526413] [<c0219bb1>] debug_dma_map_page+0xfe/0x119
[ 11.526420] [<c02a7d9e>] usb_hcd_submit_urb+0x228/0x9ce
[ 11.526429] [<c0143ce7>] ? put_lock_stats+0xd/0x21
[ 11.526434] [<c0143df6>] ? lock_release_holdtime+0xfb/0x103
[ 11.526440] [<c0356378>] ? _spin_unlock+0x2c/0x41
[ 11.526446] [<c01455b6>] ? debug_check_no_locks_freed+0x2b/0xff
[ 11.526451] [<c0145589>] ? trace_hardirqs_on+0xb/0xd
[ 11.526457] [<c014567e>] ? debug_check_no_locks_freed+0xf3/0xff
[ 11.526463] [<c0144192>] ? lockdep_init_map+0x81/0x3f5
[ 11.526469] [<c0145589>] ? trace_hardirqs_on+0xb/0xd
[ 11.526476] [<c02a89ee>] usb_submit_urb+0x1e6/0x202
[ 11.526482] [<c02a97fe>] usb_start_wait_urb+0x3d/0x9a
[ 11.526489] [<c02a9a74>] usb_control_msg+0x107/0x120
[ 11.526499] [<f9a67b45>] atp_geyser_init+0x3b/0x10f [appletouch]
[ 11.526507] [<f9a6719f>] ? atp_complete_geyser_3_4+0x0/0x47c [appletouch]
[ 11.526514] [<f9a67c36>] atp_handle_geyser+0x1d/0x37 [appletouch]
[ 11.526522] [<f9a67f18>] atp_probe+0x1b4/0x3b0 [appletouch]
[ 11.526528] [<c02ab10a>] usb_probe_interface+0xd0/0x110
[ 11.526536] [<c02733db>] driver_probe_device+0x85/0x111
[ 11.526542] [<c02734af>] __driver_attach+0x48/0x64
[ 11.526548] [<c0272d95>] bus_for_each_dev+0x42/0x6c
[ 11.526554] [<c027329c>] driver_attach+0x19/0x1b
[ 11.526560] [<c0273467>] ? __driver_attach+0x0/0x64
[ 11.526566] [<c02727a9>] bus_add_driver+0xf9/0x213
[ 11.526571] [<c02736f5>] driver_register+0x90/0xed
[ 11.526577] [<c0217d8d>] ? __spin_lock_init+0x24/0x4b
[ 11.526582] [<c02aaf32>] usb_register_driver+0x79/0xd6
[ 11.526590] [<f9a6c017>] atp_init+0x17/0x19 [appletouch]
[ 11.526595] [<c0101141>] do_one_initcall+0x4f/0x116
[ 11.526602] [<f9a6c000>] ? atp_init+0x0/0x19 [appletouch]
[ 11.526610] [<c013a9f4>] ? up_read+0x1b/0x2f
[ 11.526616] [<c013b298>] ? __blocking_notifier_call_chain+0x45/0x51
[ 11.526624] [<c014fa77>] sys_init_module+0x8e/0x196
[ 11.526629] [<c0102a88>] sysenter_do_call+0x12/0x36
[ 11.526634] ---[ end trace 212ca97a23247c2a ]---
[ 11.529720] appletouch: Geyser mode initialized.
Signed-off-by: Bob Copeland <me@...copeland.com>
---
drivers/input/mouse/appletouch.c | 24 ++++++++++++++++++------
1 files changed, 18 insertions(+), 6 deletions(-)
diff --git a/drivers/input/mouse/appletouch.c b/drivers/input/mouse/appletouch.c
index 454b961..e0140fd 100644
--- a/drivers/input/mouse/appletouch.c
+++ b/drivers/input/mouse/appletouch.c
@@ -255,15 +255,22 @@ MODULE_PARM_DESC(debug, "Activate debugging output");
*/
static int atp_geyser_init(struct usb_device *udev)
{
- char data[8];
+ char *data;
int size;
int i;
+ int ret;
+
+ data = kmalloc(8, GFP_KERNEL);
+ if (!data) {
+ err("Out of memory");
+ return -ENOMEM;
+ }
size = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
ATP_GEYSER_MODE_READ_REQUEST_ID,
USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
ATP_GEYSER_MODE_REQUEST_VALUE,
- ATP_GEYSER_MODE_REQUEST_INDEX, &data, 8, 5000);
+ ATP_GEYSER_MODE_REQUEST_INDEX, data, 8, 5000);
if (size != 8) {
dprintk("atp_geyser_init: read error\n");
@@ -271,7 +278,8 @@ static int atp_geyser_init(struct usb_device *udev)
dprintk("appletouch[%d]: %d\n", i, data[i]);
err("Failed to read mode from device.");
- return -EIO;
+ ret = -EIO;
+ goto out_free;
}
/* Apply the mode switch */
@@ -281,7 +289,7 @@ static int atp_geyser_init(struct usb_device *udev)
ATP_GEYSER_MODE_WRITE_REQUEST_ID,
USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
ATP_GEYSER_MODE_REQUEST_VALUE,
- ATP_GEYSER_MODE_REQUEST_INDEX, &data, 8, 5000);
+ ATP_GEYSER_MODE_REQUEST_INDEX, data, 8, 5000);
if (size != 8) {
dprintk("atp_geyser_init: write error\n");
@@ -289,9 +297,13 @@ static int atp_geyser_init(struct usb_device *udev)
dprintk("appletouch[%d]: %d\n", i, data[i]);
err("Failed to request geyser raw mode");
- return -EIO;
+ ret = -EIO;
+ goto out_free;
}
- return 0;
+ ret = 0;
+out_free:
+ kfree(data);
+ return ret;
}
/*
--
1.6.0.6
--
Bob Copeland %% www.bobcopeland.com
--
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