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62b7f5931c
bcm2708: boot tested on RPi B+ v1.2
bcm2709: boot tested on RPi 3B v1.2 and RPi 4B v1.1 4G
bcm2710: boot tested on RPi 3B v1.2
bcm2711: boot tested on RPi 4B v1.1 4G
Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
(cherry-picked from commit f07e572f64)
57 lines
1.7 KiB
Diff
57 lines
1.7 KiB
Diff
From 22198e801db7542c59098a75bdab120bcbc42652 Mon Sep 17 00:00:00 2001
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From: Phil Elwell <phil@raspberrypi.com>
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Date: Wed, 30 Sep 2020 19:23:43 +0100
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Subject: [PATCH] USB: gadget: f_hid: avoid crashes and log spam
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Disconnecting and reconnecting the USB cable can lead to crashes and a
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variety of kernel log spam. Try to fix or minimise both.
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See: https://github.com/raspberrypi/linux/issues/3870
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Signed-off-by: Phil Elwell <phil@raspberrypi.com>
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---
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drivers/usb/gadget/function/f_hid.c | 18 +++++++++++++++++-
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1 file changed, 17 insertions(+), 1 deletion(-)
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--- a/drivers/usb/gadget/function/f_hid.c
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+++ b/drivers/usb/gadget/function/f_hid.c
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@@ -344,6 +344,11 @@ static ssize_t f_hidg_write(struct file
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spin_lock_irqsave(&hidg->write_spinlock, flags);
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+ if (!hidg->req) {
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+ spin_unlock_irqrestore(&hidg->write_spinlock, flags);
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+ return -ESHUTDOWN;
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+ }
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+
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#define WRITE_COND (!hidg->write_pending)
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try_again:
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/* write queue */
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@@ -364,7 +369,13 @@ try_again:
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count = min_t(unsigned, count, hidg->report_length);
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spin_unlock_irqrestore(&hidg->write_spinlock, flags);
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- status = copy_from_user(req->buf, buffer, count);
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+ if (req) {
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+ status = copy_from_user(req->buf, buffer, count);
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+ } else {
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+ ERROR(hidg->func.config->cdev, "hidg->req is NULL\n");
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+ status = -ESHUTDOWN;
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+ goto release_write_pending;
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+ }
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if (status != 0) {
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ERROR(hidg->func.config->cdev,
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@@ -393,6 +404,11 @@ try_again:
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spin_unlock_irqrestore(&hidg->write_spinlock, flags);
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+ if (!hidg->in_ep->enabled) {
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+ ERROR(hidg->func.config->cdev, "in_ep is disabled\n");
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+ status = -ESHUTDOWN;
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+ goto release_write_pending;
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+ }
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status = usb_ep_queue(hidg->in_ep, req, GFP_ATOMIC);
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if (status < 0) {
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ERROR(hidg->func.config->cdev,
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