From 906c9768c7750ce76b85597174b9c3599a6ca9f6 Mon Sep 17 00:00:00 2001 From: Sebastian Ott Date: Mon, 25 Oct 2010 16:10:30 +0200 Subject: [S390] chsc: use the global page to determine the chp desriptor chsc_determine_channel_path_desc is called by a wrapper who allocates a response struct. The response data is then memcpy'ed to this response struct by chsc_determine_channel_path_desc. Change chsc_determine_base_channel_path_desc to use the global chsc_page and deliver it to the function doing the actual chsc call. The channel path desriptor is then directly read from the response data. As a result we get rid of the additional allocation for the response struct. Signed-off-by: Sebastian Ott Signed-off-by: Martin Schwidefsky --- drivers/s390/cio/chsc.c | 54 ++++++++++++++----------------------------------- 1 file changed, 15 insertions(+), 39 deletions(-) (limited to 'drivers/s390/cio/chsc.c') diff --git a/drivers/s390/cio/chsc.c b/drivers/s390/cio/chsc.c index d12c152..27aca39 100644 --- a/drivers/s390/cio/chsc.c +++ b/drivers/s390/cio/chsc.c @@ -639,36 +639,18 @@ chsc_secm(struct channel_subsystem *css, int enable) } int chsc_determine_channel_path_desc(struct chp_id chpid, int fmt, int rfmt, - int c, int m, - struct chsc_response_struct *resp) + int c, int m, void *page) { + struct chsc_scpd *scpd_area; int ccode, ret; - struct { - struct chsc_header request; - u32 : 2; - u32 m : 1; - u32 c : 1; - u32 fmt : 4; - u32 cssid : 8; - u32 : 4; - u32 rfmt : 4; - u32 first_chpid : 8; - u32 : 24; - u32 last_chpid : 8; - u32 zeroes1; - struct chsc_header response; - u8 data[PAGE_SIZE - 20]; - } __attribute__ ((packed)) *scpd_area; - if ((rfmt == 1) && !css_general_characteristics.fcs) return -EINVAL; if ((rfmt == 2) && !css_general_characteristics.cib) return -EINVAL; - spin_lock_irq(&chsc_page_lock); - memset(chsc_page, 0, PAGE_SIZE); - scpd_area = chsc_page; + memset(page, 0, PAGE_SIZE); + scpd_area = page; scpd_area->request.length = 0x0010; scpd_area->request.code = 0x0002; scpd_area->cssid = chpid.cssid; @@ -680,20 +662,13 @@ int chsc_determine_channel_path_desc(struct chp_id chpid, int fmt, int rfmt, scpd_area->rfmt = rfmt; ccode = chsc(scpd_area); - if (ccode > 0) { - ret = (ccode == 3) ? -ENODEV : -EBUSY; - goto out; - } + if (ccode > 0) + return (ccode == 3) ? -ENODEV : -EBUSY; ret = chsc_error_from_response(scpd_area->response.code); - if (ret == 0) - /* Success. */ - memcpy(resp, &scpd_area->response, scpd_area->response.length); - else + if (ret) CIO_CRW_EVENT(2, "chsc: scpd failed (rc=%04x)\n", scpd_area->response.code); -out: - spin_unlock_irq(&chsc_page_lock); return ret; } EXPORT_SYMBOL_GPL(chsc_determine_channel_path_desc); @@ -702,17 +677,18 @@ int chsc_determine_base_channel_path_desc(struct chp_id chpid, struct channel_path_desc *desc) { struct chsc_response_struct *chsc_resp; + struct chsc_scpd *scpd_area; int ret; - chsc_resp = kzalloc(sizeof(*chsc_resp), GFP_KERNEL); - if (!chsc_resp) - return -ENOMEM; - ret = chsc_determine_channel_path_desc(chpid, 0, 0, 0, 0, chsc_resp); + spin_lock_irq(&chsc_page_lock); + scpd_area = chsc_page; + ret = chsc_determine_channel_path_desc(chpid, 0, 0, 0, 0, scpd_area); if (ret) - goto out_free; + goto out; + chsc_resp = (void *)&scpd_area->response; memcpy(desc, &chsc_resp->data, sizeof(*desc)); -out_free: - kfree(chsc_resp); +out: + spin_unlock_irq(&chsc_page_lock); return ret; } -- cgit v1.1