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authorYoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>2016-06-27 15:36:53 +0900
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2016-08-20 18:11:04 +0200
commit300a15d778eb0c1793824c2f682c705fd18a158d (patch)
tree0cfab5c3c5b921165f80c1ab33ec5612e63eb667
parent799c8305a1ee822647df272d77f61ae28acd31ab (diff)
phy: rcar-gen3-usb2: fix mutex_lock calling in interrupt
commit c14f8a4032efa73d9c4e155add47c19252b3bdf4 upstream. This patch fixes an issue that the extcon_set_cable_state_() is possible to cause "BUG: scheduling while atomic" because this driver calls extcon_set_cable_state_() in the interrupt handler and mutex_lock() is possible to be called by like the following call trace. So, this patch adds a workqueue function to resolve this issue. [ 9.706504] BUG: scheduling while atomic: systemd-journal/25893/0x00010303 [ 9.714569] Modules linked in: [ 9.717629] CPU: 0 PID: 25893 Comm: systemd-journal Not tainted 4.7.0-rc4+ #86 [ 9.724844] Hardware name: Renesas Salvator-X board based on r8a7795 (DT) [ 9.731624] Call trace: [ 9.734077] [<ffff0000080889f0>] dump_backtrace+0x0/0x1a8 [ 9.739470] [<ffff000008088bac>] show_stack+0x14/0x20 [ 9.744520] [<ffff000008348ab4>] dump_stack+0x94/0xb8 [ 9.749568] [<ffff0000080da18c>] __schedule_bug+0x44/0x58 [ 9.754966] [<ffff0000087c6394>] __schedule+0x4e4/0x598 [ 9.760185] [<ffff0000087c6484>] schedule+0x3c/0xa8 [ 9.765057] [<ffff0000087c6928>] schedule_preempt_disabled+0x20/0x38 [ 9.771408] [<ffff0000080f20dc>] mutex_optimistic_spin+0x18c/0x1d0 [ 9.777583] [<ffff0000087c7ef0>] __mutex_lock_slowpath+0x38/0x140 [ 9.783669] [<ffff0000087c803c>] mutex_lock+0x44/0x60 [ 9.788717] [<ffff00000834ca48>] kobject_uevent_env+0x250/0x500 [ 9.794634] [<ffff0000086ae8c0>] extcon_update_state+0x220/0x298 [ 9.800634] [<ffff0000086ae9d8>] extcon_set_cable_state_+0x78/0x88 [ 9.806812] [<ffff000008376004>] rcar_gen3_device_recognition+0x5c/0xe0 [ 9.813420] [<ffff0000083761bc>] rcar_gen3_phy_usb2_irq+0x3c/0x48 [ 9.819509] [<ffff0000080fae94>] handle_irq_event_percpu+0x94/0x140 [ 9.825769] [<ffff0000080faf88>] handle_irq_event+0x48/0x78 [ 9.831334] [<ffff0000080fe620>] handle_fasteoi_irq+0xb8/0x1b0 [ 9.837162] [<ffff0000080fa3c4>] generic_handle_irq+0x24/0x38 [ 9.842900] [<ffff0000080fa6fc>] __handle_domain_irq+0x5c/0xb8 [ 9.848727] [<ffff000008081520>] gic_handle_irq+0x58/0xb0 Reported-by: Simon Horman <horms@verge.net.au> Fixes: 2b38543c8db1 ("phy: rcar-gen3-usb2: add extcon support") Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--drivers/phy/phy-rcar-gen3-usb2.c26
1 files changed, 22 insertions, 4 deletions
diff --git a/drivers/phy/phy-rcar-gen3-usb2.c b/drivers/phy/phy-rcar-gen3-usb2.c
index 4be3f5dbbc9f..31156c9c4707 100644
--- a/drivers/phy/phy-rcar-gen3-usb2.c
+++ b/drivers/phy/phy-rcar-gen3-usb2.c
@@ -21,6 +21,7 @@
#include <linux/phy/phy.h>
#include <linux/platform_device.h>
#include <linux/regulator/consumer.h>
+#include <linux/workqueue.h>
/******* USB2.0 Host registers (original offset is +0x200) *******/
#define USB2_INT_ENABLE 0x000
@@ -81,9 +82,25 @@ struct rcar_gen3_chan {
struct extcon_dev *extcon;
struct phy *phy;
struct regulator *vbus;
+ struct work_struct work;
+ bool extcon_host;
bool has_otg;
};
+static void rcar_gen3_phy_usb2_work(struct work_struct *work)
+{
+ struct rcar_gen3_chan *ch = container_of(work, struct rcar_gen3_chan,
+ work);
+
+ if (ch->extcon_host) {
+ extcon_set_cable_state_(ch->extcon, EXTCON_USB_HOST, true);
+ extcon_set_cable_state_(ch->extcon, EXTCON_USB, false);
+ } else {
+ extcon_set_cable_state_(ch->extcon, EXTCON_USB_HOST, false);
+ extcon_set_cable_state_(ch->extcon, EXTCON_USB, true);
+ }
+}
+
static void rcar_gen3_set_host_mode(struct rcar_gen3_chan *ch, int host)
{
void __iomem *usb2_base = ch->base;
@@ -130,8 +147,8 @@ static void rcar_gen3_init_for_host(struct rcar_gen3_chan *ch)
rcar_gen3_set_host_mode(ch, 1);
rcar_gen3_enable_vbus_ctrl(ch, 1);
- extcon_set_cable_state_(ch->extcon, EXTCON_USB_HOST, true);
- extcon_set_cable_state_(ch->extcon, EXTCON_USB, false);
+ ch->extcon_host = true;
+ schedule_work(&ch->work);
}
static void rcar_gen3_init_for_peri(struct rcar_gen3_chan *ch)
@@ -140,8 +157,8 @@ static void rcar_gen3_init_for_peri(struct rcar_gen3_chan *ch)
rcar_gen3_set_host_mode(ch, 0);
rcar_gen3_enable_vbus_ctrl(ch, 0);
- extcon_set_cable_state_(ch->extcon, EXTCON_USB_HOST, false);
- extcon_set_cable_state_(ch->extcon, EXTCON_USB, true);
+ ch->extcon_host = false;
+ schedule_work(&ch->work);
}
static bool rcar_gen3_check_id(struct rcar_gen3_chan *ch)
@@ -301,6 +318,7 @@ static int rcar_gen3_phy_usb2_probe(struct platform_device *pdev)
if (irq >= 0) {
int ret;
+ INIT_WORK(&channel->work, rcar_gen3_phy_usb2_work);
irq = devm_request_irq(dev, irq, rcar_gen3_phy_usb2_irq,
IRQF_SHARED, dev_name(dev), channel);
if (irq < 0)