[PATCH] hid: logitech: don't use stack based dj_report structures
From: Marc Dionne <hidden>
Date: 2012-06-01 22:12:34
On a system with a logitech wireless keyboard/mouse and DMA-API debugging enabled, this warning appears at boot: kernel: WARNING: at lib/dma-debug.c:929 check_for_stack.part.12+0x70/0xa7() kernel: Hardware name: MS-7593 kernel: uhci_hcd 0000:00:1d.1: DMA-API: device driver maps memory fromstack [addr=ffff8801b0079c29] Make logi_dj_recv_query_paired_devices and logi_dj_recv_switch_to_dj_mode use a structure allocated with kzalloc rather than a stack based one. Signed-off-by: Marc Dionne <redacted> --- drivers/hid/hid-logitech-dj.c | 38 ++++++++++++++++++++++++-------------- 1 file changed, 24 insertions(+), 14 deletions(-)
diff --git a/drivers/hid/hid-logitech-dj.c b/drivers/hid/hid-logitech-dj.c
index 5e8a7ed..0f9c146 100644
--- a/drivers/hid/hid-logitech-dj.c
+++ b/drivers/hid/hid-logitech-dj.c@@ -436,27 +436,37 @@ static int logi_dj_recv_send_report(struct dj_receiver_dev *djrcv_dev, static int logi_dj_recv_query_paired_devices(struct dj_receiver_dev *djrcv_dev) { - struct dj_report dj_report; + struct dj_report *dj_report; + int retval; - memset(&dj_report, 0, sizeof(dj_report)); - dj_report.report_id = REPORT_ID_DJ_SHORT; - dj_report.device_index = 0xFF; - dj_report.report_type = REPORT_TYPE_CMD_GET_PAIRED_DEVICES; - return logi_dj_recv_send_report(djrcv_dev, &dj_report); + dj_report = kzalloc(sizeof(dj_report), GFP_KERNEL); + if (!dj_report) + return -ENOMEM; + dj_report->report_id = REPORT_ID_DJ_SHORT; + dj_report->device_index = 0xFF; + dj_report->report_type = REPORT_TYPE_CMD_GET_PAIRED_DEVICES; + retval = logi_dj_recv_send_report(djrcv_dev, dj_report); + kfree(dj_report); + return retval; } static int logi_dj_recv_switch_to_dj_mode(struct dj_receiver_dev *djrcv_dev, unsigned timeout) { - struct dj_report dj_report; + struct dj_report *dj_report; + int retval; - memset(&dj_report, 0, sizeof(dj_report)); - dj_report.report_id = REPORT_ID_DJ_SHORT; - dj_report.device_index = 0xFF; - dj_report.report_type = REPORT_TYPE_CMD_SWITCH; - dj_report.report_params[CMD_SWITCH_PARAM_DEVBITFIELD] = 0x3F; - dj_report.report_params[CMD_SWITCH_PARAM_TIMEOUT_SECONDS] = (u8)timeout; - return logi_dj_recv_send_report(djrcv_dev, &dj_report); + dj_report = kzalloc(sizeof(dj_report), GFP_KERNEL); + if (!dj_report) + return -ENOMEM; + dj_report->report_id = REPORT_ID_DJ_SHORT; + dj_report->device_index = 0xFF; + dj_report->report_type = REPORT_TYPE_CMD_SWITCH; + dj_report->report_params[CMD_SWITCH_PARAM_DEVBITFIELD] = 0x3F; + dj_report->report_params[CMD_SWITCH_PARAM_TIMEOUT_SECONDS] = (u8)timeout; + retval = logi_dj_recv_send_report(djrcv_dev, dj_report); + kfree(dj_report); + return retval; }
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1.7.10.2