diff options
Diffstat (limited to 'drivers/usb/storage/usb.c')
| -rw-r--r-- | drivers/usb/storage/usb.c | 20 |
1 files changed, 14 insertions, 6 deletions
diff --git a/drivers/usb/storage/usb.c b/drivers/usb/storage/usb.c index d36f3b6992bb..152ee3376550 100644 --- a/drivers/usb/storage/usb.c +++ b/drivers/usb/storage/usb.c @@ -1056,13 +1056,20 @@ int usb_stor_probe1(struct us_data **pus, goto BadDevice; /* - * Some USB host controllers can't do DMA; they have to use PIO. - * For such controllers we need to make sure the block layer sets - * up bounce buffers in addressable memory. + * Some USB host controllers can't do DMA: They have to use PIO, or they + * have to use a small dedicated local memory area, or they have other + * restrictions on addressable memory. + * + * We can't support these controllers on highmem systems as we don't + * kmap or bounce buffer. */ - if (!hcd_uses_dma(bus_to_hcd(us->pusb_dev->bus)) || - bus_to_hcd(us->pusb_dev->bus)->localmem_pool) - host->no_highmem = true; + if (IS_ENABLED(CONFIG_HIGHMEM) && + (!hcd_uses_dma(bus_to_hcd(us->pusb_dev->bus)) || + bus_to_hcd(us->pusb_dev->bus)->localmem_pool)) { + dev_warn(&intf->dev, "USB Mass Storage not supported on this host controller\n"); + result = -EINVAL; + goto release; + } /* Get the unusual_devs entries and the descriptors */ result = get_device_info(us, id, unusual_dev); @@ -1081,6 +1088,7 @@ int usb_stor_probe1(struct us_data **pus, BadDevice: usb_stor_dbg(us, "storage_probe() failed\n"); +release: release_everything(us); return result; } |