In enable sink sysfs function, when etr is enabled, it doesn't need to call enable hw function again.
[ 91.057233] ------------[ cut here ]------------ [ 91.061983] WARNING: CPU: 6 PID: 145 at drivers/hwtracing/coresight/coresight-tmc-etr.c:1038 tmc_etr_enable_hw+0xc4/0xd0 [ 91.073153] Modules linked in: [ 91.076302] CPU: 6 PID: 145 Comm: sh Tainted: G S W 6.5.0-rc3-g66d5eaa9e5a7 #111 [ 91.085149] Hardware name: Qualcomm Technologies, Inc. SM8450 QRD (DT) [ 91.091847] pstate: 634000c5 (nZCv daIF +PAN -UAO +TCO +DIT -SSBS BTYPE=--) [ 91.099000] pc : tmc_etr_enable_hw+0xc4/0xd0 [ 91.103389] lr : tmc_enable_etr_sink+0x13c/0x294 [ 91.108130] sp : ffff8000815cbb30 [ 91.111537] x29: ffff8000815cbb30 x28: ffff68ce4352a800 x27: 0000000000000000 [ 91.118868] x26: ffff68ce414cc040 x25: ffff68ce414a82e0 x24: 0000000000000000 [ 91.126199] x23: ffff68ce423a1ee0 x22: ffff68ce423a1e80 x21: ffff68ce4352a800 [ 91.133527] x20: 0000000000000001 x19: ffff68ce414aa500 x18: fffffda31cf9c008 [ 91.140857] x17: 0000000000000040 x16: 0000000000000001 x15: fffffc0000000000 [ 91.148188] x14: 00000000f0000080 x13: 0000000000000000 x12: ffff9739c0000000 [ 91.155516] x11: ffffbe9cdf71e400 x10: 0000000000001000 x9 : ffff68d0b29e3b28 [ 91.162845] x8 : fffffda31cf983c8 x7 : fffffda31cf98388 x6 : 00000000ffffffd0 [ 91.170174] x5 : ffff68ce435d8ec0 x4 : ffff68d0b29e2610 x3 : ffff68ce435d8ec0 [ 91.177502] x2 : ffff68ce414aa500 x1 : ffff68ce414aa500 x0 : ffff68ce423a1e80 [ 91.184833] Call trace: [ 91.187349] tmc_etr_enable_hw+0xc4/0xd0 [ 91.191388] tmc_enable_etr_sink+0x13c/0x294 [ 91.195777] coresight_enable_path+0x21c/0x24c [ 91.200347] coresight_enable+0x9c/0x204 [ 91.204379] enable_source_store+0x58/0xa0 [ 91.208595] dev_attr_store+0x18/0x2c [ 91.212361] sysfs_kf_write+0x40/0x54 [ 91.216126] kernfs_fop_write_iter+0x164/0x1dc [ 91.220692] vfs_write+0x3a8/0x460 [ 91.224191] ksys_write+0x6c/0x100 [ 91.227690] __arm64_sys_write+0x1c/0x28 [ 91.231728] invoke_syscall+0x44/0x100 [ 91.235586] el0_svc_common.constprop.1+0x6c/0xe4 [ 91.240418] do_el0_svc+0x38/0x94 [ 91.243833] el0_svc+0x28/0x74 [ 91.246981] el0t_64_sync_handler+0xa0/0xc4 [ 91.251282] el0t_64_sync+0x174/0x178 [ 91.255045] ---[ end trace 0000000000000000 ]--- sh: write error: Device or resource busy
Signed-off-by: Mao Jinlong quic_jinlmao@quicinc.com --- drivers/hwtracing/coresight/coresight-tmc-etr.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/hwtracing/coresight/coresight-tmc-etr.c b/drivers/hwtracing/coresight/coresight-tmc-etr.c index 66dc5f97a009..e1c7bae9f6ee 100644 --- a/drivers/hwtracing/coresight/coresight-tmc-etr.c +++ b/drivers/hwtracing/coresight/coresight-tmc-etr.c @@ -1204,7 +1204,7 @@ static struct etr_buf *tmc_etr_get_sysfs_buffer(struct coresight_device *csdev)
static int tmc_enable_etr_sink_sysfs(struct coresight_device *csdev) { - int ret; + int ret = 0; unsigned long flags; struct tmc_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); struct etr_buf *sysfs_buf = tmc_etr_get_sysfs_buffer(csdev); @@ -1213,12 +1213,16 @@ static int tmc_enable_etr_sink_sysfs(struct coresight_device *csdev) return PTR_ERR(sysfs_buf);
spin_lock_irqsave(&drvdata->spinlock, flags); + if (drvdata->mode == CS_MODE_SYSFS) + goto out; + ret = tmc_etr_enable_hw(drvdata, sysfs_buf); if (!ret) { drvdata->mode = CS_MODE_SYSFS; atomic_inc(&csdev->refcnt); }
+out: spin_unlock_irqrestore(&drvdata->spinlock, flags);
if (!ret)