diff options
| author | Paul Bolle <pebolle@tiscali.nl> | 2016-03-03 13:01:41 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2016-06-10 11:39:09 +0200 |
| commit | cf2cf0f50c14e86e04cda2c684357eed77922666 (patch) | |
| tree | 813cf2759a4d5174ee0ce847af3713e4a817d47e /arch | |
| parent | 7faf90ef995ea470f32f43810266ece8ac8ba6c7 (diff) | |
lguest: Read offset of device_cap later
Read the offset of the capability with type VIRTIO_PCI_CAP_DEVICE_CFG
only when we're sure we're going to need it. Which is when all checks
have passed and we know we have a virtio console with an emerg_wr field.
Signed-off-by: Paul Bolle <pebolle@tiscali.nl>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: lguest@lists.ozlabs.org
Link: http://lkml.kernel.org/r/1457006501-5377-3-git-send-email-pebolle@tiscali.nl
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/lguest/boot.c | 12 |
1 files changed, 3 insertions, 9 deletions
diff --git a/arch/x86/lguest/boot.c b/arch/x86/lguest/boot.c index 146d11c8cf78..25da5bc8d83d 100644 --- a/arch/x86/lguest/boot.c +++ b/arch/x86/lguest/boot.c @@ -1233,8 +1233,6 @@ static void write_bar_via_cfg(u32 cfg_offset, u32 off, u32 val) static void probe_pci_console(void) { u8 cap, common_cap = 0, device_cap = 0; - /* Offset within BAR0 */ - u32 device_offset; u32 device_len; /* Avoid recursive printk into here. */ @@ -1258,21 +1256,16 @@ static void probe_pci_console(void) u8 vndr = read_pci_config_byte(0, 1, 0, cap); if (vndr == PCI_CAP_ID_VNDR) { u8 type, bar; - u32 offset; type = read_pci_config_byte(0, 1, 0, cap + offsetof(struct virtio_pci_cap, cfg_type)); bar = read_pci_config_byte(0, 1, 0, cap + offsetof(struct virtio_pci_cap, bar)); - offset = read_pci_config(0, 1, 0, - cap + offsetof(struct virtio_pci_cap, offset)); switch (type) { case VIRTIO_PCI_CAP_DEVICE_CFG: - if (bar == 0) { + if (bar == 0) device_cap = cap; - device_offset = offset; - } break; case VIRTIO_PCI_CAP_PCI_CFG: console_access_cap = cap; @@ -1302,7 +1295,8 @@ static void probe_pci_console(void) return; } - console_cfg_offset = device_offset; + console_cfg_offset = read_pci_config(0, 1, 0, + device_cap + offsetof(struct virtio_pci_cap, offset)); printk(KERN_INFO "lguest: Console via virtio-pci emerg_wr\n"); } |