diff options
author | Dave Airlie <airlied@redhat.com> | 2017-04-19 11:07:14 +1000 |
---|---|---|
committer | Dave Airlie <airlied@redhat.com> | 2017-04-19 11:07:14 +1000 |
commit | 856ee92e8602bd86d34388ac08381c5cb3918756 (patch) | |
tree | c3bed2bf85214f78239724adb34a1c2d6ec8444d /drivers/char | |
parent | a6a5c983b35e579071370d4eb2b4ed8ad5c18da9 (diff) | |
parent | 4f7d029b9bf009fbee76bb10c0c4351a1870d2f3 (diff) |
Merge tag 'v4.11-rc7' into drm-next
Backmerge Linux 4.11-rc7 from Linus tree, to fix some
conflicts that were causing problems with the rerere cache
in drm-tip.
Diffstat (limited to 'drivers/char')
-rw-r--r-- | drivers/char/mem.c | 82 | ||||
-rw-r--r-- | drivers/char/virtio_console.c | 6 |
2 files changed, 56 insertions, 32 deletions
diff --git a/drivers/char/mem.c b/drivers/char/mem.c index 6d9cc2d39d22..7e4a9d1296bb 100644 --- a/drivers/char/mem.c +++ b/drivers/char/mem.c @@ -60,6 +60,10 @@ static inline int valid_mmap_phys_addr_range(unsigned long pfn, size_t size) #endif #ifdef CONFIG_STRICT_DEVMEM +static inline int page_is_allowed(unsigned long pfn) +{ + return devmem_is_allowed(pfn); +} static inline int range_is_allowed(unsigned long pfn, unsigned long size) { u64 from = ((u64)pfn) << PAGE_SHIFT; @@ -75,6 +79,10 @@ static inline int range_is_allowed(unsigned long pfn, unsigned long size) return 1; } #else +static inline int page_is_allowed(unsigned long pfn) +{ + return 1; +} static inline int range_is_allowed(unsigned long pfn, unsigned long size) { return 1; @@ -122,23 +130,31 @@ static ssize_t read_mem(struct file *file, char __user *buf, while (count > 0) { unsigned long remaining; + int allowed; sz = size_inside_page(p, count); - if (!range_is_allowed(p >> PAGE_SHIFT, count)) + allowed = page_is_allowed(p >> PAGE_SHIFT); + if (!allowed) return -EPERM; + if (allowed == 2) { + /* Show zeros for restricted memory. */ + remaining = clear_user(buf, sz); + } else { + /* + * On ia64 if a page has been mapped somewhere as + * uncached, then it must also be accessed uncached + * by the kernel or data corruption may occur. + */ + ptr = xlate_dev_mem_ptr(p); + if (!ptr) + return -EFAULT; - /* - * On ia64 if a page has been mapped somewhere as uncached, then - * it must also be accessed uncached by the kernel or data - * corruption may occur. - */ - ptr = xlate_dev_mem_ptr(p); - if (!ptr) - return -EFAULT; + remaining = copy_to_user(buf, ptr, sz); + + unxlate_dev_mem_ptr(p, ptr); + } - remaining = copy_to_user(buf, ptr, sz); - unxlate_dev_mem_ptr(p, ptr); if (remaining) return -EFAULT; @@ -181,30 +197,36 @@ static ssize_t write_mem(struct file *file, const char __user *buf, #endif while (count > 0) { + int allowed; + sz = size_inside_page(p, count); - if (!range_is_allowed(p >> PAGE_SHIFT, sz)) + allowed = page_is_allowed(p >> PAGE_SHIFT); + if (!allowed) return -EPERM; - /* - * On ia64 if a page has been mapped somewhere as uncached, then - * it must also be accessed uncached by the kernel or data - * corruption may occur. - */ - ptr = xlate_dev_mem_ptr(p); - if (!ptr) { - if (written) - break; - return -EFAULT; - } + /* Skip actual writing when a page is marked as restricted. */ + if (allowed == 1) { + /* + * On ia64 if a page has been mapped somewhere as + * uncached, then it must also be accessed uncached + * by the kernel or data corruption may occur. + */ + ptr = xlate_dev_mem_ptr(p); + if (!ptr) { + if (written) + break; + return -EFAULT; + } - copied = copy_from_user(ptr, buf, sz); - unxlate_dev_mem_ptr(p, ptr); - if (copied) { - written += sz - copied; - if (written) - break; - return -EFAULT; + copied = copy_from_user(ptr, buf, sz); + unxlate_dev_mem_ptr(p, ptr); + if (copied) { + written += sz - copied; + if (written) + break; + return -EFAULT; + } } buf += sz; diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c index e9b7e0b3cabe..87fe111d0be6 100644 --- a/drivers/char/virtio_console.c +++ b/drivers/char/virtio_console.c @@ -2202,14 +2202,16 @@ static int virtcons_freeze(struct virtio_device *vdev) vdev->config->reset(vdev); - virtqueue_disable_cb(portdev->c_ivq); + if (use_multiport(portdev)) + virtqueue_disable_cb(portdev->c_ivq); cancel_work_sync(&portdev->control_work); cancel_work_sync(&portdev->config_work); /* * Once more: if control_work_handler() was running, it would * enable the cb as the last step. */ - virtqueue_disable_cb(portdev->c_ivq); + if (use_multiport(portdev)) + virtqueue_disable_cb(portdev->c_ivq); remove_controlq_data(portdev); list_for_each_entry(port, &portdev->ports, list) { |