/* * mmap.c * * Copyright (C) 1995, 1996 by Volker Lendecke * Modified 1997 Peter Waltenberg, Bill Hawes, David Woodhouse for 2.1 dcache * */ #include #include #include #include #include #include #include #include #include #include #include #include #include "ncp_fs.h" /* * Fill in the supplied page for mmap * XXX: how are we excluding truncate/invalidate here? Maybe need to lock * page? */ static int ncp_file_mmap_fault(struct vm_area_struct *area, struct vm_fault *vmf) { struct inode *inode = file_inode(area->vm_file); char *pg_addr; unsigned int already_read; unsigned int count; int bufsize; int pos; /* XXX: loff_t ? */ /* * ncpfs has nothing against high pages as long * as recvmsg and memset works on it */ vmf->page = alloc_page(GFP_HIGHUSER); if (!vmf->page) return VM_FAULT_OOM; pg_addr = kmap(vmf->page); pos = vmf->pgoff << PAGE_SHIFT; count = PAGE_SIZE; /* what we can read in one go */ bufsize = NCP_SERVER(inode)->buffer_size; already_read = 0; if (ncp_make_open(inode, O_RDONLY) >= 0) { while (already_read < count) { int read_this_time; int to_read; to_read = bufsize - (pos % bufsize); to_read = min_t(unsigned int, to_read, count - already_read); if (ncp_read_kernel(NCP_SERVER(inode), NCP_FINFO(inode)->file_handle, pos, to_read, pg_addr + already_read, &read_this_time) != 0) { read_this_time = 0; } pos += read_this_time; already_read += read_this_time; if (read_this_time < to_read) { break; } } ncp_inode_close(inode); } if (already_read < PAGE_SIZE) memset(pg_addr + already_read, 0, PAGE_SIZE - already_read); flush_dcache_page(vmf->page); kunmap(vmf->page); /* * If I understand ncp_read_kernel() properly, the above always * fetches from the network, here the analogue of disk. * -- nyc */ count_vm_event(PGMAJFAULT); mem_cgroup_count_vm_event(area->vm_mm, PGMAJFAULT); return VM_FAULT_MAJOR; } static const struct vm_operations_struct ncp_file_mmap = { .fault = ncp_file_mmap_fault, }; /* This is used for a general mmap of a ncp file */ int ncp_mmap(struct file *file, struct vm_area_struct *vma) { struct inode *inode = file_inode(file); ncp_dbg(1, "called\n"); if (!ncp_conn_valid(NCP_SERVER(inode))) return -EIO; /* only PAGE_COW or read-only supported now */ if (vma->vm_flags & VM_SHARED) return -EINVAL; /* we do not support files bigger than 4GB... We eventually supports just 4GB... */ if (vma_pages(vma) + vma->vm_pgoff > (1U << (32 - PAGE_SHIFT))) return -EFBIG; vma->vm_ops = &ncp_file_mmap; file_accessed(file); return 0; } ss='txt' type='search' size='10' name='q' value=''/>
path: root/sound/soc/codecs/cs4271-spi.c
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authorLuuk Paulussen <luuk.paulussen@alliedtelesis.co.nz>2016-12-08 11:43:34 +1300
committerRalf Baechle <ralf@linux-mips.org>2016-12-11 11:19:04 +0100
commitedb6fa1a6452edf736c04d02e3f6de59043df69e (patch)
treef854dd896b1e5033a26f305ec9a50a87b1b13939 /sound/soc/codecs/cs4271-spi.c
parent3e5de27e940d00d8d504dfb96625fb654f641509 (diff)
MIPS: Return -ENODEV from weak implementation of rtc_mips_set_time
The sync_cmos_clock function in kernel/time/ntp.c first tries to update the internal clock of the cpu by calling the "update_persistent_clock64" architecture specific function. If this returns -ENODEV, it then tries to update an external RTC using "rtc_set_ntp_time". On the mips architecture, the weak implementation of the underlying function would return 0 if it wasn't overridden. This meant that the sync_cmos_clock function would never try to update an external RTC (if both CONFIG_GENERIC_CMOS_UPDATE and CONFIG_RTC_SYSTOHC are configured) Returning -ENODEV instead, means that an external RTC will be tried. Signed-off-by: Luuk Paulussen <luuk.paulussen@alliedtelesis.co.nz> Reviewed-by: Richard Laing <richard.laing@alliedtelesis.co.nz> Reviewed-by: Scott Parlane <scott.parlane@alliedtelesis.co.nz> Reviewed-by: Chris Packham <chris.packham@alliedtelesis.co.nz> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/14649/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'sound/soc/codecs/cs4271-spi.c')